Redhat AS4 python errors

Hi, I did a fresh install and ran up2date on RedHat AS4. After install of NAV 3.3.2, i get python error like below when accessing through browser..please help Mod_python error: "PythonHeaderParserHandler nav.web" Traceback (most recent call last): File "/usr/lib/python2.3/site-packages/mod_python/apache.py", line 299, in HandlerDispatch result = object(req) File "/usr/local/nav/lib/python/nav/web/__init__.py", line 64, in headerparserhandler user = req.session['user'] KeyError: 'user' Ed