ValueError: list.remove(x): x not in list

[lyma]

How to Reproduce

While doing a GET operation on /tasklist, Trac issued an internal error.

User Agent was: Mozilla/5.0 (X11; U; Linux i686; pt-BR; rv:1.9.1) Gecko/20090624 Firefox/3.5

System Information

Trac	0.11.5rc2
Python	2.4.3 (#1, Jan 21 2009, 01:10:13) [GCC 4.1.2 20071124 (Red Hat 4.1.2-42)]
setuptools	0.6c9
SQLite	3.3.6
pysqlite	1.1.7
Genshi	0.5.1
mod_python	3.2.8
Subversion	1.4.2 (r22196)
jQuery:	1.2.6

Python Traceback

Traceback (most recent call last):
  File "/usr/lib/python2.4/site-packages/Trac-0.11.5rc2-py2.4.egg/trac/web/main.py", line 444, in _dispatch_request
    dispatcher.dispatch(req)
  File "/usr/lib/python2.4/site-packages/Trac-0.11.5rc2-py2.4.egg/trac/web/main.py", line 205, in dispatch
    resp = chosen_handler.process_request(req)
  File "build/bdist.linux-i686/egg/tasklist/main.py", line 171, in process_request
ValueError: list.remove(x): x not in list

[Remy Blank]

PluginIssue (tasklist).

[Lyma]

To solve this "error" just follow the "exemple" in ​http://trac-hacks.org/wiki/TaskListPlugin.