Trac detected an internal error:

unsupported operand type(s) for +=: 'NoneType' and 'str'
Traceback (most recent call last):
  File "/home/myusername/packages/lib/python2.3/site-packages/trac/web/fcgi_frontend.py", line 40, in _handler
    dispatch_request(req.path_info, req, env)
  File "/home/myusername/packages/lib/python2.3/site-packages/trac/web/main.py", line 139, in dispatch_request
    dispatcher.dispatch(req)
  File "/home/myusername/packages/lib/python2.3/site-packages/trac/web/main.py", line 84, in dispatch
    populate_hdf(req.hdf, self.env, req)
  File "/home/myusername/packages/lib/python2.3/site-packages/trac/web/main.py", line 155, in populate_hdf
    hdf['trac.href'] = {
  File "/home/myusername/packages/lib/python2.3/site-packages/trac/web/href.py", line 157, in <lambda>
    self._derived[name] = lambda *args, **kw: self(name, *args, **kw)
  File "/home/myusername/packages/lib/python2.3/site-packages/trac/web/href.py", line 144, in __call__
    href += '/' + path
TypeError: unsupported operand type(s) for +=: 'NoneType' and 'str'
Content-Type: text/plain

Oops...

Trac detected an internal error:

0

Traceback (most recent call last):
  File "/home/myusername/packages/share/trac/cgi-bin/trac.fcgi", line 20, in ?
    fcgi_frontend.run()
  File "/home/myusername/packages/lib/python2.3/site-packages/trac/web/fcgi_frontend.py", line 28, in run
    _fcgi.Server(_handler).run()
  File "/home/myusername/packages/lib/python2.3/site-packages/trac/web/_fcgi.py", line 1049, in run
    sock = self._setupSocket()
  File "/home/myusername/packages/lib/python2.3/site-packages/trac/web/_fcgi.py", line 994, in _setupSocket
    req.run()
  File "/home/myusername/packages/lib/python2.3/site-packages/trac/web/_fcgi.py", line 580, in run
    self._end(appStatus, protocolStatus)
  File "/home/myusername/packages/lib/python2.3/site-packages/trac/web/_fcgi.py", line 606, in _end
    sys.exit(appStatus)
SystemExit: 0