python - Why I am getting TypeError on production server where I am trying to save data in the session? -


environment:

request method: request url: django_server_running_on_apache  django version: 1.3.3 python version: 2.7.3  traceback: file "/usr/local/lib/python2.7/dist-packages/django/core/handlers/base.py" in get_response   178.                 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/file.py" in save   121.                     os.write(output_file_fd, self.encode(session_data)) file "/usr/local/lib/python2.7/dist-packages/django/contrib/sessions/backends/base.py" in encode   93.         pickled = pickle.dumps(session_dict, pickle.highest_protocol)  exception type: typeerror @ / exception value: expected string or unicode object, nonetype found

it recommended store scalar objects in session. pickel fails serialize other objects.


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