AttributeError: 'UserExtensiblePermissionStore' object has no attribute 'group_providers'

[anonymous]

Traceback (most recent call last):

  File "/usr/local/lib/python2.7/dist-packages/Trac-1.0-py2.7.egg/trac/web/main.py", line 497, in _dispatch_request
    dispatcher.dispatch(req)
  File "/usr/local/lib/python2.7/dist-packages/Trac-1.0-py2.7.egg/trac/web/main.py", line 214, in dispatch
    resp = chosen_handler.process_request(req)
  File "/usr/local/lib/python2.7/dist-packages/Trac-1.0-py2.7.egg/trac/wiki/web_ui.py", line 125, in process_request
    req.perm(page.resource).require('WIKI_VIEW')
  File "/usr/local/lib/python2.7/dist-packages/Trac-1.0-py2.7.egg/trac/perm.py", line 578, in require
    if not self._has_permission(action, resource):
  File "/usr/local/lib/python2.7/dist-packages/Trac-1.0-py2.7.egg/trac/perm.py", line 570, in _has_permission
    check_permission(action, perm.username, resource, perm)
  File "/usr/local/lib/python2.7/dist-packages/Trac-1.0-py2.7.egg/trac/perm.py", line 462, in check_permission
    perm)
  File "/usr/local/lib/python2.7/dist-packages/Trac-1.0-py2.7.egg/trac/perm.py", line 296, in check_permission
    get_user_permissions(username)
  File "/usr/local/lib/python2.7/dist-packages/Trac-1.0-py2.7.egg/trac/perm.py", line 398, in get_user_permissions
    for perm in self.store.get_user_permissions(username) or []:
  File "/usr/local/lib/python2.7/dist-packages/TracDirectoryAuth-1.0.1-py2.7.egg/tracext/dirauth/api.py", line 54, in get_user_permissions
    for provider in self.group_providers:
AttributeError: 'UserExtensiblePermissionStore' object has no attribute 'group_providers'