[web2py] Error with uwsgi

[Jose]

after upgrading uwsgi from version 0.9.5.3 to 0.9.6 this error occurs:

Traceback (most recent call last):
  File "gluon/main.py", line 411, in wsgibase
    session._try_store_on_disk(request, response)
  File "gluon/globals.py", line 377, in _try_store_on_disk
    cPickle.dump(dict(self), response.session_file)
  File "/usr/local/lib/python2.6/copy_reg.py", line 84, in _reduce_ex
    dict = getstate()
TypeError: 'NoneType' object is not callable

My server: freebsd + cherokee + uwgsi

Jose