Traceback (most recent call last):

  File "/usr/lib/python2.6/site-packages/trac/web/api.py", line 440, in send_error

    data, 'text/html')

  File "/usr/lib/python2.6/site-packages/trac/web/chrome.py", line 830, in render_template

    message = req.session.pop('chrome.%s.%d' % (type_, i))

  File "/usr/lib/python2.6/site-packages/trac/web/api.py", line 216, in __getattr__

    value = self.callbacks[name](self)

  File "/usr/lib/python2.6/site-packages/trac/web/main.py", line 303, in _get_session

    return Session(self.env, req)

  File "/usr/lib/python2.6/site-packages/trac/web/session.py", line 198, in __init__

    self.get_session(sid)

  File "/usr/lib/python2.6/site-packages/trac/web/session.py", line 219, in get_session

    super(Session, self).get_session(sid, authenticated)

  File "/usr/lib/python2.6/site-packages/trac/web/session.py", line 70, in get_session

    """, (sid, int(authenticated)))

  File "/usr/lib/python2.6/site-packages/trac/db/util.py", line 65, in execute

    return self.cursor.execute(sql_escape_percent(sql), args)

  File "/usr/lib/python2.6/site-packages/trac/db/sqlite_backend.py", line 78, in execute

    result = PyFormatCursor.execute(self, *args)

  File "/usr/lib/python2.6/site-packages/trac/db/sqlite_backend.py", line 56, in execute

    args or [])

  File "/usr/lib/python2.6/site-packages/trac/db/sqlite_backend.py", line 48, in _rollback_on_error

    return function(self, *args, **kwargs)

OperationalError: database is locked