file based session error

I'm getting the following error:

    data = sess.session_storage.load(sess.session_id)
  File
"/usr/lib/python2.4/site-packages/CherryPy-2.2.1-py2.4
.egg/cherrypy/filters/sessionfilter.py",
line 271, in load
    data = pickle.load(f)
UnpicklingError: invalid load key, '
'.

What can I do to prevent an error like above from cripling
my web site?


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