NameError: global name 'TagSystem' is not defined

[Michael@…]

How to Reproduce

While doing a POST operation on /discussion, Trac issued an internal error.

(please provide additional details here)

Request parameters:

{'__FORM_TOKEN': u'1c436b35d4f33318fd993922',
 'description': u'',
 'discussion_action': u'post-add',
 'group': u'0',
 'name': u'',
 'subject': u'',
 'submit': u'Submit',
 'tags': u'',
 'unregistered_subscribers': u''}

User Agent was: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_6_8) AppleWebKit/534.50 (KHTML, like Gecko) Version/5.1 Safari/534.50

System Information

Trac	0.11.7
Python	2.7.1+ (r271:86832, Apr 11 2011, 18:13:53) [GCC 4.5.2]
setuptools	0.6
psycopg2	2.2.1
Genshi	0.6
Pygments	1.4
Subversion	1.6.12 (r955767)
jQuery:	1.5

Python Traceback

Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/trac/web/main.py", line 450, in _dispatch_request
    dispatcher.dispatch(req)
  File "/usr/lib/python2.7/dist-packages/trac/web/main.py", line 206, in dispatch
    resp = chosen_handler.process_request(req)
  File "/usr/local/lib/python2.7/dist-packages/TracDiscussion-0.8_r9877-py2.7.egg/tracdiscussion/core.py", line 112, in process_request
    template, data = api.process_discussion(context)
  File "/usr/local/lib/python2.7/dist-packages/TracDiscussion-0.8_r9877-py2.7.egg/tracdiscussion/api.py", line 259, in process_discussion
    self._do_actions(context, actions)
  File "/usr/local/lib/python2.7/dist-packages/TracDiscussion-0.8_r9877-py2.7.egg/tracdiscussion/api.py", line 792, in _do_actions
    context.forum = self.get_forum_by_time(context, forum['time'])
  File "/usr/local/lib/python2.7/dist-packages/TracDiscussion-0.8_r9877-py2.7.egg/tracdiscussion/api.py", line 1641, in get_forum_by_time
    tag_system = TagSystem(self.env)
NameError: global name 'TagSystem' is not defined

[Remy Blank]

PluginIssue (TracDiscussion).