Mod_python error: "PythonHandler handler"

Traceback (most recent call last):

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

  File "/vol/web/html/continue/handler.py", line 160, in handler
    return common.RequestProcessor(config.serverRoot,config.serverName,authfn,BaseHandler(),common.ExceptionHandler(),'text/plain').handle(req)

  File "common.py", line 315, in handle
    result.send(req)

  File "common.py", line 143, in send
    req.sendfile(self.path)

IOError: Could not stat file for reading