Mod_python error: "PythonHandler virenv"

Traceback (most recent call last):

  File "/usr/lib/python2.4/site-packages/mod_python/apache.py", line 299, in HandlerDispatch
    result = object(req)

  File "/usr/lib/python2.4/site-packages/django/core/handlers/modpython.py", line 177, in handler

  File "/usr/lib/python2.4/site-packages/django/core/handlers/modpython.py", line 154, in __call__

  File "/usr/lib/python2.4/site-packages/django/contrib/sessions/middleware.py", line 89, in process_response

  File "/usr/lib/python2.4/site-packages/django/contrib/sessions/models.py", line 37, in get_new_session_object

  File "/usr/lib/python2.4/site-packages/django/contrib/sessions/models.py", line 21, in get_new_session_key

  File "/usr/lib/python2.4/site-packages/django/db/models/manager.py", line 73, in get

  File "/usr/lib/python2.4/site-packages/django/db/models/query.py", line 250, in get

  File "/usr/lib/python2.4/site-packages/django/db/models/query.py", line 108, in __iter__

  File "/usr/lib/python2.4/site-packages/django/db/models/query.py", line 470, in _get_data

  File "/usr/lib/python2.4/site-packages/django/db/models/query.py", line 183, in iterator

  File "/usr/lib/python2.4/site-packages/django/db/backends/util.py", line 12, in execute

  File "build/bdist.linux-i686/egg/MySQLdb/cursors.py", line 173, in execute

  File "build/bdist.linux-i686/egg/MySQLdb/connections.py", line 36, in defaulterrorhandler

OperationalError: (1033, "Incorrect information in file: './theatre/django_session.frm'")