Can't pickle <type 'instancemethod'>: attribute lookup __builtin__.instancemethod failed?
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i there, i am getting a Can't pickle <type 'instancemethod'>: attribute lookup __builtin__.instancemethod failed 

Traceback:
File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/base.py" in get_response
  188.                 response = middleware_method(request, response)
File "/usr/local/lib/python2.7/dist-packages/django/contrib/sessions/middleware.py" in process_response
  36.                 request.session.save()
File "/usr/local/lib/python2.7/dist-packages/django/contrib/sessions/backends/db.py" in save
  52.             session_data=self.encode(self._get_session(no_load=must_create)),
File "/usr/local/lib/python2.7/dist-packages/django/contrib/sessions/backends/base.py" in encode
  79.         pickled = pickle.dumps(session_dict, pickle.HIGHEST_PROTOCOL)

Exception Type: PicklingError at /loggedin/
Exception Value: Can't pickle <type 'instancemethod'>: attribute lookup __builtin__.instancemethod failed

i think its related to the fact i am using sessions, and i am trying the save a list that has a models.FileField to it. I read somewhere that was not possible with sessions, is there a workaround for my problem?