Mod_python error: "PythonHandler index"

Traceback (most recent call last):

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

  File "/var/www/beehive/codons-noc/index.py", line 464, in handler
    req.write(go(req,req.args))

  File "/var/www/beehive/codons-noc/index.py", line 411, in go
    sys.exit(0)

SystemExit: 0