500 Internal error

The server encountered an unexpected condition which prevented it from fulfilling the request.

Page handler: <bound method Root.index of <niplwiki.controllers.Root object at 0x89f68ac>>
Traceback (most recent call last):
  File "/usr/lib/python2.5/site-packages/CherryPy-2.2.1-py2.5.egg/cherrypy/_cphttptools.py", line 105, in _run
    self.main()
  File "/usr/lib/python2.5/site-packages/CherryPy-2.2.1-py2.5.egg/cherrypy/_cphttptools.py", line 254, in main
    body = page_handler(*virtual_path, **self.params)
  File "<string>", line 3, in index
  File "/usr/lib/python2.5/site-packages/TurboGears-1.0.2.2-py2.5.egg/turbogears/controllers.py", line 336, in expose
    *args, **kw)
  File "<string>", line 5, in run_with_transaction
  File "/usr/lib/python2.5/site-packages/TurboGears-1.0.2.2-py2.5.egg/turbogears/database.py", line 303, in so_rwt
    retval = func(*args, **kw)
  File "<string>", line 5, in _expose
  File "/usr/lib/python2.5/site-packages/TurboGears-1.0.2.2-py2.5.egg/turbogears/controllers.py", line 351, in <lambda>
    mapping, fragment, args, kw)))
  File "/usr/lib/python2.5/site-packages/TurboGears-1.0.2.2-py2.5.egg/turbogears/controllers.py", line 378, in _execute_func
    output = errorhandling.try_call(func, *args, **kw)
  File "/usr/lib/python2.5/site-packages/TurboGears-1.0.2.2-py2.5.egg/turbogears/errorhandling.py", line 73, in try_call
    return func(self, *args, **kw)
  File "/home/shriphani/Desktop/NIPLWiki/niplwiki/controllers.py", line 11, in index
    content = publish_parts(page.data, writer_name="html")['html_body']
NameError: global name 'publish_parts' is not defined