Mod_python error: "PythonHandler slowfoothandler"

Traceback (most recent call last):

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

  File "/home/cq2web/slowfoot/slowfoothandler.py", line 58, in handler
    req.go()

  File "/home/cq2web/slowfoot/request.py", line 250, in go
    self.handle(self.req.uri, self.____data)

  File "/home/cq2web/slowfoot/request.py", line 296, in handle
    self.handlepsp(self, path, data)

  File "/home/cq2web/slowfoot/request.py", line 215, in handlepsp
    self._handlepsp(req, path, data)

  File "/home/cq2web/slowfoot/slowfoothandler.py", line 89, in handlepsp
    psp.PSP(target, filename = templatename).run(data)

  File "/usr/lib/python2.4/site-packages/mod_python/psp.py", line 111, in __init__
    self.load_from_file()

  File "/usr/lib/python2.4/site-packages/mod_python/psp.py", line 164, in load_from_file
    raise ValueError, "%s is not a file" % filename

ValueError: /home/cq2web/cq2web/data/Meresco is not a file