[web2py] background task error

[pbreit]

Trying to run a background task from MacOS command line and getting error:

pbreit$ python web2py.py -S myapp -M -N -R 
applications/myapp/private/expire_items.py
Traceback (most recent call last):
  File "web2py.py", line 3, in <module>
    import gluon.import_all
ImportError: No module named gluon.import_all