Hi,

I get the following error when I try to build the documentation in sage-8.1 
:


MacBook-Pro-de-Paul:sage-8.1 mercatp$ ./sage --docbuild reference html

[manifolds] *loading pickled environment... *not yet created

[manifolds] *building [mo]: *targets for 0 po files that are out of date

[manifolds] *building [html]*: targets for 52 source files that are out of 
date

[manifolds] *updating environment: *52 added, 0 changed, 0 removed

[manifolds] *reading sources... *[  1%] chart                              
                                                                            
                            *reading sources... *[  3%] continuous_map     
                                                                            
                                            *reading sources... *[  5%] 
diff_form                                                                  
                                                                *reading 
sources... *[  7%] diff_manifold                                            
                                                                            
      *reading sources... *[  9%] diff_map                                 
                                                                            
                      *reading sources... *[ 11%] diff_scalarfield         
                                                                            
                                      *reading sources... *[ 13%] index    
                                                                            
                                                      *reading sources... *[ 
15%] manifold                                                               
                                                                    *reading 
sources... *[ 17%] multivector                                              
                                                                            
      *reading sources... *[ 19%] riem_manifold                            
                                                                            
                      *reading sources... *[ 21%] sage/manifolds/chart     
                                                                            
                                      *reading sources... *[ 23%] 
sage/manifolds/continuous_map                                              
                                                                *reading 
sources... *[ 25%] sage/manifolds/coord_func                                
                                                                            
      *reading sources... *[ 26%] sage/manifolds/coord_func_symb           
                                                                            
                      *reading sources... *[ 28%] 
sage/manifolds/differentiable/affine_connection                            
                                                                *reading 
sources... *[ 30%] sage/manifolds/differentiable/automorphismfield          
                                                                            
      *reading sources... *[ 32%] 
sage/manifolds/differentiable/automorphismfield_group                      
                                                                *reading 
sources... *[ 34%] sage/manifolds/differentiable/chart                      
                                                                            
      *reading sources... *[ 36%] sage/manifolds/differentiable/curve      
                                                                            
                      *reading sources... *[ 38%] 
sage/manifolds/differentiable/diff_form                                    
                                                                *reading 
sources... *[ 40%] sage/manifolds/differentiable/diff_form_module           
                                                                            
      *reading sources... *[ 42%] sage/manifolds/differentiable/diff_map   
                                                                            
                      *reading sources... *[ 44%] 
sage/manifolds/differentiable/integrated_curve                             
                                                                *reading 
sources... *[ 46%] sage/manifolds/differentiable/levi_civita_connection     
                                                                            
      *reading sources... *[ 48%] sage/manifolds/differentiable/manifold   
                                                                            
                      *reading sources... *[ 50%] 
sage/manifolds/differentiable/manifold_homset                              
                                                                *reading 
sources... *[ 51%] sage/manifolds/differentiable/metric                     
                                                                            
      *reading sources... *[ 53%] 
sage/manifolds/differentiable/multivector_module                           
                                                                *reading 
sources... *[ 55%] sage/manifolds/differentiable/multivectorfield           
                                                                            
      *reading sources... *[ 57%] sage/manifolds/differentiable/real_line  
                                                                            
                      *reading sources... *[ 59%] 
sage/manifolds/differentiable/scalarfield                                  
                                                                *reading 
sources... *[ 61%] sage/manifolds/differentiable/scalarfield_algebra        
                                                                            
      *reading sources... *[ 63%] 
sage/manifolds/differentiable/tangent_space                                
                                                                *reading 
sources... *[ 65%] sage/manifolds/differentiable/tangent_vector             
                                                                            
      *reading sources... *[ 67%] sage/manifolds/differentiable/tensorfield  
                                                                            
                    *reading sources... *[ 69%] 
sage/manifolds/differentiable/tensorfield_module                           
                                                                *reading 
sources... *[ 71%] sage/manifolds/differentiable/tensorfield_paral          
                                                                            
      *reading sources... *[ 73%] sage/manifolds/differentiable/vectorfield  
                                                                            
                    *reading sources... *[ 75%] 
sage/manifolds/differentiable/vectorfield_module                           
                                                                *reading 
sources... *[ 76%] sage/manifolds/differentiable/vectorframe                
                                                                            
      *reading sources... *[ 78%] sage/manifolds/manifold                  
                                                                            
                      *reading sources... *[ 80%] 
sage/manifolds/manifold_homset                                             
                                                                *reading 
sources... *[ 82%] sage/manifolds/point                                     
                                                                            
      *reading sources... *[ 84%] sage/manifolds/scalarfield               
                                                                            
                      *reading sources... *[ 86%] 
sage/manifolds/scalarfield_algebra                                         
                                                                *reading 
sources... *[ 88%] sage/manifolds/structure                                 
                                                                            
      *reading sources... *[ 90%] sage/manifolds/subset                    
                                                                            
                      *reading sources... *[ 92%] sage/manifolds/utilities   
                                                                            
                                    *reading sources... *[ 94%] scalarfield  
                                                                            
                                                  *reading sources... *[ 
96%] tangent_space                                                          
                                                                    *reading 
sources... *[ 98%] tensorfield                                              
                                                                            
      *reading sources... *[100%] vectorfield

[manifolds] *loading cross citations... looking for now-outdated files... *none 
found

[manifolds] *pickling environment... *done

[manifolds] *checking consistency... *done

[manifolds] *preparing documents... *done

[manifolds] *writing output... *[  1%] chart                               
                                                                            
                            *writing output... *[  3%] continuous_map      
                                                                            
                                            *writing output... *[  5%] 
diff_form                                                                   
                                                                *writing 
output... *[  7%] diff_manifold                                             
                                                                            
      *writing output... *[  9%] diff_map                                  
                                                                            
                      *writing output... *[ 11%] diff_scalarfield          
                                                                            
                                      *writing output... *[ 13%] index     
                                                                            
                                                      *writing output... *[ 
15%] manifold                                                              
                                                                      *writing 
output... *[ 17%] multivector                                               
                                                                            
      *writing output... *[ 19%] riem_manifold                             
                                                                            
                      *writing output... *[ 21%] sage/manifolds/chart      
                                                                            
                                      *writing output... *[ 23%] 
sage/manifolds/continuous_map                                               
                                                                *writing 
output... *[ 25%] sage/manifolds/coord_func                                 
                                                                            
      *writing output... *[ 26%] sage/manifolds/coord_func_symb            
                                                                            
                      *writing output... *[ 28%] 
sage/manifolds/differentiable/affine_connection                             
                                                                *writing 
output... *[ 30%] sage/manifolds/differentiable/automorphismfield           
                                                                            
      *writing output... *[ 32%] 
sage/manifolds/differentiable/automorphismfield_group                       
                                                                *writing 
output... *[ 34%] sage/manifolds/differentiable/chart                       
                                                                            
      *writing output... *[ 36%] sage/manifolds/differentiable/curve       
                                                                            
                      *writing output... *[ 38%] 
sage/manifolds/differentiable/diff_form                                     
                                                                *writing 
output... *[ 40%] sage/manifolds/differentiable/diff_form_module            
                                                                            
      *writing output... *[ 42%] sage/manifolds/differentiable/diff_map    
                                                                            
                      *writing output... *[ 44%] 
sage/manifolds/differentiable/integrated_curve                              
                                                                *writing 
output... *[ 46%] sage/manifolds/differentiable/levi_civita_connection      
                                                                            
      *writing output... *[ 48%] sage/manifolds/differentiable/manifold    
                                                                            
                      *writing output... *[ 50%] 
sage/manifolds/differentiable/manifold_homset                               
                                                                *writing 
output... *[ 51%] sage/manifolds/differentiable/metric                      
                                                                            
      *writing output... *[ 53%] 
sage/manifolds/differentiable/multivector_module                            
                                                                *writing 
output... *[ 55%] sage/manifolds/differentiable/multivectorfield            
                                                                            
      *writing output... *[ 57%] sage/manifolds/differentiable/real_line   
                                                                            
                      *writing output... *[ 59%] 
sage/manifolds/differentiable/scalarfield                                   
                                                                *writing 
output... *[ 61%] sage/manifolds/differentiable/scalarfield_algebra         
                                                                            
      *writing output... *[ 63%] sage/manifolds/differentiable/tangent_space   
                                                                            
                  *writing output... *[ 65%] 
sage/manifolds/differentiable/tangent_vector                                
                                                                *writing 
output... *[ 67%] sage/manifolds/differentiable/tensorfield                 
                                                                            
      *writing output... *[ 69%] 
sage/manifolds/differentiable/tensorfield_module                            
                                                                *writing 
output... *[ 71%] sage/manifolds/differentiable/tensorfield_paral           
                                                                            
      *writing output... *[ 73%] sage/manifolds/differentiable/vectorfield   
                                                                            
                    *writing output... *[ 75%] 
sage/manifolds/differentiable/vectorfield_module                            
                                                                *writing 
output... *[ 76%] sage/manifolds/differentiable/vectorframe                 
                                                                            
      *writing output... *[ 78%] sage/manifolds/manifold                   
                                                                            
                      *writing output... *[ 80%] 
sage/manifolds/manifold_homset                                              
                                                                *writing 
output... *[ 82%] sage/manifolds/point                                      
                                                                            
      *writing output... *[ 84%] sage/manifolds/scalarfield                
                                                                            
                      *writing output... *[ 86%] 
sage/manifolds/scalarfield_algebra                                          
                                                                *writing 
output... *[ 88%] sage/manifolds/structure                                  
                                                                            
      *writing output... *[ 90%] sage/manifolds/subset                     
                                                                            
                      *writing output... *[ 92%] sage/manifolds/utilities  
                                                                            
                                      *writing output... *[ 94%] scalarfield   
                                                                            
                                                  *writing output... *[ 
96%] tangent_space                                                         
                                                                      *writing 
output... *[ 98%] tensorfield                                               
                                                                            
      *writing output... *[100%] vectorfield

*[manifolds]* 
/Users/mercatp/sage-8.1/src/doc/en/reference/manifolds/index.rst:4: 
WARNING: undefined label: tensors-on-free-modules (if the link has no 
caption the label must precede a section header)

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/chart.py:docstring
 
of sage.manifolds.chart:18: WARNING: citation not found: Lee2011

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/chart.py:docstring
 
of sage.manifolds.chart:19: WARNING: citation not found: Lee2013

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/continuous_map.py:docstring
 
of sage.manifolds.continuous_map:12: WARNING: citation not found: KN1963

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/continuous_map.py:docstring
 
of sage.manifolds.continuous_map:13: WARNING: citation not found: Lee2011

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/affine_connection.py:docstring
 
of sage.manifolds.differentiable.affine_connection:11: WARNING: citation 
not found: Lee1997

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/affine_connection.py:docstring
 
of sage.manifolds.differentiable.affine_connection:12: WARNING: citation 
not found: KN1963

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/affine_connection.py:docstring
 
of sage.manifolds.differentiable.affine_connection:13: WARNING: citation 
not found: ONe1983

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/automorphismfield_group.py:docstring
 
of sage.manifolds.differentiable.automorphismfield_group:24: WARNING: 
citation not found: God1968

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/chart.py:docstring
 
of sage.manifolds.differentiable.chart:19: WARNING: citation not found: 
Lee2013

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/curve.py:docstring
 
of sage.manifolds.differentiable.curve:19: WARNING: citation not found: 
KN1963

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/curve.py:docstring
 
of sage.manifolds.differentiable.curve:20: WARNING: citation not found: 
Lee2013

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/diff_form.py:docstring
 
of sage.manifolds.differentiable.diff_form:43: WARNING: citation not found: 
KN1963

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/diff_form.py:docstring
 
of sage.manifolds.differentiable.diff_form:44: WARNING: citation not found: 
Lee2013

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/diff_form_module.py:docstring
 
of sage.manifolds.differentiable.diff_form_module:20: WARNING: citation not 
found: KN1963

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/diff_form_module.py:docstring
 
of sage.manifolds.differentiable.diff_form_module:21: WARNING: citation not 
found: Lee2013

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/diff_map.py:docstring
 
of sage.manifolds.differentiable.diff_map:16: WARNING: citation not found: 
KN1963

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/diff_map.py:docstring
 
of sage.manifolds.differentiable.diff_map:17: WARNING: citation not found: 
Lee2013

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/levi_civita_connection.py:docstring
 
of sage.manifolds.differentiable.levi_civita_connection:12: WARNING: 
citation not found: KN1963

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/levi_civita_connection.py:docstring
 
of sage.manifolds.differentiable.levi_civita_connection:13: WARNING: 
citation not found: Lee1997

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/levi_civita_connection.py:docstring
 
of sage.manifolds.differentiable.levi_civita_connection:14: WARNING: 
citation not found: ONe1983

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/manifold.py:docstring
 
of sage.manifolds.differentiable.manifold:1: WARNING: citation not found: 
Ser1992

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/manifold.py:docstring
 
of sage.manifolds.differentiable.manifold:1: WARNING: citation not found: 
Ber2008

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/manifold.py:docstring
 
of sage.manifolds.differentiable.manifold:418: WARNING: citation not found: 
Lee2013

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/manifold.py:docstring
 
of sage.manifolds.differentiable.manifold:419: WARNING: citation not found: 
KN1963

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/manifold.py:docstring
 
of sage.manifolds.differentiable.manifold:420: WARNING: citation not found: 
Huy2005

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/manifold.py:docstring
 
of sage.manifolds.differentiable.manifold:421: WARNING: citation not found: 
Ser1992

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/manifold.py:docstring
 
of sage.manifolds.differentiable.manifold:422: WARNING: citation not found: 
Ber2008

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/manifold.py:docstring
 
of sage.manifolds.differentiable.manifold:423: WARNING: citation not found: 
BG1988

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/manifold.py:docstring
 
of sage.manifolds.differentiable.manifold.DifferentiableManifold:3: 
WARNING: citation not found: Ser1992

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/manifold.py:docstring
 
of sage.manifolds.differentiable.manifold.DifferentiableManifold:3: 
WARNING: citation not found: Ber2008

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/manifold_homset.py:docstring
 
of sage.manifolds.differentiable.manifold_homset:30: WARNING: citation not 
found: Lee2013

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/manifold_homset.py:docstring
 
of sage.manifolds.differentiable.manifold_homset:31: WARNING: citation not 
found: KN1963

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/metric.py:docstring
 
of sage.manifolds.differentiable.metric:13: WARNING: citation not found: 
KN1963

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/metric.py:docstring
 
of sage.manifolds.differentiable.metric:14: WARNING: citation not found: 
Lee1997

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/metric.py:docstring
 
of sage.manifolds.differentiable.metric:15: WARNING: citation not found: 
ONe1983

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/multivector_module.py:docstring
 
of sage.manifolds.differentiable.multivector_module:20: WARNING: citation 
not found: BG1980

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/multivector_module.py:docstring
 
of sage.manifolds.differentiable.multivector_module:21: WARNING: citation 
not found: Mar1997

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/multivectorfield.py:docstring
 
of sage.manifolds.differentiable.multivectorfield:23: WARNING: citation not 
found: BG1980

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/multivectorfield.py:docstring
 
of sage.manifolds.differentiable.multivectorfield:24: WARNING: citation not 
found: Mar1997

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/multivectorfield.py:docstring
 
of 
sage.manifolds.differentiable.multivectorfield.MultivectorField.bracket:47: 
WARNING: citation not found: Mar1997

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/multivectorfield.py:docstring
 
of 
sage.manifolds.differentiable.multivectorfield.MultivectorField.bracket:47: 
WARNING: citation not found: Kos1985

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/multivectorfield.py:docstring
 
of 
sage.manifolds.differentiable.multivectorfield.MultivectorField.bracket:47: 
WARNING: citation not found: Nij1955

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/multivectorfield.py:docstring
 
of 
sage.manifolds.differentiable.multivectorfield.MultivectorField.bracket:47: 
WARNING: citation not found: Lic1977

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/multivectorfield.py:docstring
 
of 
sage.manifolds.differentiable.multivectorfield.MultivectorField.bracket:47: 
WARNING: citation not found: Vai1994

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/multivectorfield.py:docstring
 
of 
sage.manifolds.differentiable.multivectorfield.MultivectorFieldParal.bracket:47:
 
WARNING: citation not found: Mar1997

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/multivectorfield.py:docstring
 
of 
sage.manifolds.differentiable.multivectorfield.MultivectorFieldParal.bracket:47:
 
WARNING: citation not found: Kos1985

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/multivectorfield.py:docstring
 
of 
sage.manifolds.differentiable.multivectorfield.MultivectorFieldParal.bracket:47:
 
WARNING: citation not found: Nij1955

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/multivectorfield.py:docstring
 
of 
sage.manifolds.differentiable.multivectorfield.MultivectorFieldParal.bracket:47:
 
WARNING: citation not found: Lic1977

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/multivectorfield.py:docstring
 
of 
sage.manifolds.differentiable.multivectorfield.MultivectorFieldParal.bracket:47:
 
WARNING: citation not found: Vai1994

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/real_line.py:docstring
 
of sage.manifolds.differentiable.real_line:12: WARNING: citation not found: 
Lee2013

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/scalarfield.py:docstring
 
of sage.manifolds.differentiable.scalarfield:20: WARNING: citation not 
found: KN1963

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/scalarfield.py:docstring
 
of sage.manifolds.differentiable.scalarfield:21: WARNING: citation not 
found: Lee2013

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/scalarfield.py:docstring
 
of sage.manifolds.differentiable.scalarfield:22: WARNING: citation not 
found: ONe1983

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/scalarfield_algebra.py:docstring
 
of sage.manifolds.differentiable.scalarfield_algebra:15: WARNING: citation 
not found: KN1963

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/scalarfield_algebra.py:docstring
 
of sage.manifolds.differentiable.scalarfield_algebra:16: WARNING: citation 
not found: Lee2013

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/scalarfield_algebra.py:docstring
 
of sage.manifolds.differentiable.scalarfield_algebra:17: WARNING: citation 
not found: ONe1983

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/tangent_space.py:docstring
 
of sage.manifolds.differentiable.tangent_space:11: WARNING: citation not 
found: Lee2013

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/tangent_vector.py:docstring
 
of sage.manifolds.differentiable.tangent_vector:11: WARNING: citation not 
found: Lee2013

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/tensorfield.py:docstring
 
of sage.manifolds.differentiable.tensorfield:25: WARNING: citation not 
found: KN1963

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/tensorfield.py:docstring
 
of sage.manifolds.differentiable.tensorfield:26: WARNING: citation not 
found: Lee2013

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/tensorfield.py:docstring
 
of sage.manifolds.differentiable.tensorfield:27: WARNING: citation not 
found: ONe1983

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/tensorfield_module.py:docstring
 
of sage.manifolds.differentiable.tensorfield_module:20: WARNING: citation 
not found: KN1963

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/tensorfield_module.py:docstring
 
of sage.manifolds.differentiable.tensorfield_module:21: WARNING: citation 
not found: Lee2013

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/tensorfield_module.py:docstring
 
of sage.manifolds.differentiable.tensorfield_module:22: WARNING: citation 
not found: ONe1983

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/tensorfield_paral.py:docstring
 
of sage.manifolds.differentiable.tensorfield_paral:26: WARNING: citation 
not found: KN1963

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/tensorfield_paral.py:docstring
 
of sage.manifolds.differentiable.tensorfield_paral:27: WARNING: citation 
not found: Lee2013

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/tensorfield_paral.py:docstring
 
of sage.manifolds.differentiable.tensorfield_paral:28: WARNING: citation 
not found: ONe1983

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/vectorfield.py:docstring
 
of sage.manifolds.differentiable.vectorfield:40: WARNING: citation not 
found: KN1963

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/vectorfield.py:docstring
 
of sage.manifolds.differentiable.vectorfield:41: WARNING: citation not 
found: Lee2013

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/vectorfield.py:docstring
 
of sage.manifolds.differentiable.vectorfield:42: WARNING: citation not 
found: ONe1983

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/vectorfield.py:docstring
 
of sage.manifolds.differentiable.vectorfield:43: WARNING: citation not 
found: BG1988

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/vectorfield_module.py:docstring
 
of sage.manifolds.differentiable.vectorfield_module:21: WARNING: citation 
not found: KN1963

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/vectorfield_module.py:docstring
 
of sage.manifolds.differentiable.vectorfield_module:22: WARNING: citation 
not found: Lee2013

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/vectorfield_module.py:docstring
 
of sage.manifolds.differentiable.vectorfield_module:23: WARNING: citation 
not found: ONe1983

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/differentiable/vectorframe.py:docstring
 
of sage.manifolds.differentiable.vectorframe:28: WARNING: citation not 
found: Lee2013

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/manifold.py:docstring
 
of sage.manifolds.manifold:307: WARNING: citation not found: Lee2011

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/manifold.py:docstring
 
of sage.manifolds.manifold:308: WARNING: citation not found: Lee2013

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/manifold.py:docstring
 
of sage.manifolds.manifold:309: WARNING: citation not found: KN1963

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/manifold.py:docstring
 
of sage.manifolds.manifold:310: WARNING: citation not found: Huy2005

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/manifold_homset.py:docstring
 
of sage.manifolds.manifold_homset:13: WARNING: citation not found: Lee2011

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/manifold_homset.py:docstring
 
of sage.manifolds.manifold_homset:14: WARNING: citation not found: KN1963

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/point.py:docstring
 
of sage.manifolds.point:14: WARNING: citation not found: Lee2011

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/point.py:docstring
 
of sage.manifolds.point:15: WARNING: citation not found: Lee2013

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/scalarfield.py:docstring
 
of sage.manifolds.scalarfield:18: WARNING: citation not found: Lee2011

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/scalarfield.py:docstring
 
of sage.manifolds.scalarfield:19: WARNING: citation not found: KN1963

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/scalarfield_algebra.py:docstring
 
of sage.manifolds.scalarfield_algebra:15: WARNING: citation not found: 
Lee2011

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/scalarfield_algebra.py:docstring
 
of sage.manifolds.scalarfield_algebra:16: WARNING: citation not found: 
KN1963

*[manifolds]* 
/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage/manifolds/subset.py:docstring
 
of sage.manifolds.subset:14: WARNING: citation not found: Lee2011

Error building the documentation.

Traceback (most recent call last):

  File "/Users/mercatp/sage-8.1/local/lib/python2.7/runpy.py", line 174, in 
_run_module_as_main

    "__main__", fname, loader, pkg_name)

  File "/Users/mercatp/sage-8.1/local/lib/python2.7/runpy.py", line 72, in 
_run_code

    exec code in run_globals

  File 
"/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage_setup/docbuild/__main__.py",
 
line 2, in <module>

    main()

  File 
"/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage_setup/docbuild/__init__.py",
 
line 1675, in main

    builder()

  File 
"/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage_setup/docbuild/__init__.py",
 
line 505, in _wrapper

    build_many(build_ref_doc, L)

  File 
"/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage_setup/docbuild/__init__.py",
 
line 260, in build_many

    results.append(target(arg))

  File 
"/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage_setup/docbuild/__init__.py",
 
line 71, in build_ref_doc

    getattr(ReferenceSubBuilder(doc, lang), format)(*args, **kwds)

  File 
"/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage_setup/docbuild/__init__.py",
 
line 720, in _wrapper

    getattr(DocBuilder, build_type)(self, *args, **kwds)

  File 
"/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage_setup/docbuild/__init__.py",
 
line 105, in f

    runsphinx()

  File 
"/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage_setup/docbuild/sphinxbuild.py",
 
line 218, in runsphinx

    raise exception

OSError: *[manifolds]* 
/Users/mercatp/sage-8.1/src/doc/en/reference/manifolds/index.rst:4: 
WARNING: undefined label: tensors-on-free-modules (if the link has no 
caption the label must precede a section header)


*[manifolds]* WARNING: Error building the documentation.

*[manifolds]* Traceback (most recent call last):

*[manifolds]* File "/Users/mercatp/sage-8.1/local/lib/python2.7/runpy.py", 
line 174, in _run_module_as_main

*[manifolds]* "__main__", fname, loader, pkg_name)

*[manifolds]* File "/Users/mercatp/sage-8.1/local/lib/python2.7/runpy.py", 
line 72, in _run_code

*[manifolds]* exec code in run_globals

*[manifolds]* File 
"/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage_setup/docbuild/__main__.py",
 
line 2, in <module>

*[manifolds]* main()

*[manifolds]* File 
"/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage_setup/docbuild/__init__.py",
 
line 1675, in main

*[manifolds]* builder()

*[manifolds]* File 
"/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage_setup/docbuild/__init__.py",
 
line 505, in _wrapper

*[manifolds]* build_many(build_ref_doc, L)

*[manifolds]* File 
"/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage_setup/docbuild/__init__.py",
 
line 260, in build_many

*[manifolds]* results.append(target(arg))

*[manifolds]* File 
"/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage_setup/docbuild/__init__.py",
 
line 71, in build_ref_doc

*[manifolds]* getattr(ReferenceSubBuilder(doc, lang), format)(*args, **kwds)

*[manifolds]* File 
"/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage_setup/docbuild/__init__.py",
 
line 720, in _wrapper

*[manifolds]* getattr(DocBuilder, build_type)(self, *args, **kwds)

*[manifolds]* File 
"/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage_setup/docbuild/__init__.py",
 
line 105, in f

*[manifolds]* runsphinx()

*[manifolds]* File 
"/Users/mercatp/sage-8.1/local/lib/python2.7/site-packages/sage_setup/docbuild/sphinxbuild.py",
 
line 218, in runsphinx

*[manifolds]* raise exception

*[manifolds]* OSError: *[manifolds]* 
/Users/mercatp/sage-8.1/src/doc/en/reference/manifolds/index.rst:4: 
WARNING: undefined label: tensors-on-free-modules (if the link has no 
caption the label must precede a section header)

MacBook-Pro-de-Paul:sage-8.1 mercatp$ 

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