I ran many times this worksheet and I had no problem. Today I update to new 
sagemanifolds 0.9.1 and sage-7.3 from sagemath binary (I can 't get it 
working with ppa AIMS I got rights problems)  and ran into this error :
All with exterior_der have errors, is there a way to correct it ?
Best regards

                            Traceback (most recent call 
last)<ipython-input-10-6688356e2a82> in <module>()----> 1 EM_F.exterior_der()[:]
/home/pi/sage/src/sage/structure/element.pyx in 
(/home/pi/sage/src/build/cythonized/sage/structure/element.c:4152)()    317     
        dummy_error_message.name = name    318             raise 
dummy_attribute_error--> 319         return getattr_from_other_class(self, 
P._abstract_element_class, name)    320     321     def __dir__(self):
/home/pi/sage/src/sage/structure/misc.pyx in 
(/home/pi/sage/src/build/cythonized/sage/structure/misc.c:1772)()    251        
 dummy_error_message.cls = type(self)    252         dummy_error_message.name = 
name--> 253         raise dummy_attribute_error    254     try:    255         
attribute = getattr(cls, name)
AttributeError: 'DiffFormFreeModule_with_category.element_class' object has no 
attribute 'exterior_der'

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