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Mod_python error: "PythonHandler django.core.handlers.modpython"

Traceback (most recent call last):

  File "/usr/lib/python2.5/site-packages/mod_python/apache.py", line 299, in HandlerDispatch
    result = object(req)

  File "/usr/local/lib/python2.5/site-packages/django/core/handlers/modpython.py", line 177, in handler
    return ModPythonHandler()(req)

  File "/usr/local/lib/python2.5/site-packages/django/core/handlers/modpython.py", line 150, in __call__
    response = self.get_response(request)

  File "/usr/local/lib/python2.5/site-packages/django/core/handlers/base.py", line 103, in get_response
    return callback(request, **param_dict)

  File "/home/script/faitesletest/views.py", line 83, in handler404
    {'language': request.session['language']})

  File "/usr/local/lib/python2.5/site-packages/django/contrib/sessions/middleware.py", line 20, in __getitem__
    return self._session[key]

KeyError: 'language'

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