NameError: free variable '_' referenced before assignment in enclosing scope

[admin]

How to Reproduce

While doing a GET operation on /ticket/2, Trac issued an internal error.

(please provide additional details here)

Request parameters:

{'id': u'2'}

User agent: Mozilla/5.0 (Windows NT 5.1) AppleWebKit/536.11 (KHTML, like Gecko) Chrome/20.0.1132.57 Safari/536.11

System Information

Trac	0.12.3.ja2
Babel	0.9.6
Genshi	0.6
MySQL	server: "5.5.22", client: "5.0.27", thread-safe: 1
MySQLdb	1.2.2
Python	2.5.2 (r252:60911, Feb 21 2008, 13:11:45) [MSC v.1310 32 bit (Intel)]
setuptools	0.6c9
Subversion	1.6.6 (r40053)
jQuery	1.4.4

Enabled Plugins

TicketBox	Rev
ticketcloneplugin	0.2
TopicPath	N/A
tracaccountmanager	0.3.2

Python Traceback

Traceback (most recent call last):
  File "c:\trac\tracland\tracland(ajp)\site-packages\trac-0.12.3.ja2-py2.5.egg\trac\web\main.py", line 536, in _dispatch_request
    dispatcher.dispatch(req)
  File "c:\trac\tracland\tracland(ajp)\site-packages\trac-0.12.3.ja2-py2.5.egg\trac\web\main.py", line 243, in dispatch
    resp = chosen_handler.process_request(req)
  File "c:\trac\tracland\tracland(ajp)\site-packages\trac-0.12.3.ja2-py2.5.egg\trac\ticket\web_ui.py", line 169, in process_request
    return self._process_ticket_request(req)
  File "c:\trac\tracland\tracland(ajp)\site-packages\trac-0.12.3.ja2-py2.5.egg\trac\ticket\web_ui.py", line 662, in _process_ticket_request
    add_ticket_link('first', min_id)
  File "c:\trac\tracland\tracland(ajp)\site-packages\trac-0.12.3.ja2-py2.5.egg\trac\ticket\web_ui.py", line 637, in add_ticket_link
    _("Ticket #%(id)s", id=id))
NameError: free variable '_' referenced before assignment in enclosing scope

[Remy Blank]

This is a customized version of Trac (0.12.3.ja2), please report this to the maintainer.