Oops...

Trac detected an internal error:

global name 'working_set' is not defined

Traceback (most recent call last):
  File "/var/www/cgi-bin/trac.cgi", line 20, in ?
    cgi_frontend.run()
  File "/usr/lib/python2.3/site-packages/trac/web/cgi_frontend.py", line 124, in run
    env = get_environment(req, os.environ, threaded=False)
  File "/usr/lib/python2.3/site-packages/trac/web/main.py", line 335, in get_environment
    return _open_environment(env_path, threaded)
  File "/usr/lib/python2.3/site-packages/trac/web/main.py", line 44, in _open_environment
    return open_environment(env_path)
  File "/usr/lib/python2.3/site-packages/trac/env.py", line 374, in open_environment
    env = Environment(env_path)
  File "/usr/lib/python2.3/site-packages/trac/env.py", line 86, in __init__
    load_components(self)
  File "/usr/lib/python2.3/site-packages/trac/loader.py", line 68, in load_components
    working_set.add_entry(plugins_dir)
NameError: global name 'working_set' is not defined