Traceback (most recent call last):
  File "build/bdist.linux-i686/egg/trac/web/api.py", line 440, in send_error
    data, 'text/html')
  File "build/bdist.linux-i686/egg/trac/web/chrome.py", line 827, in render_template
    message = req.session.pop('chrome.%s.%d' % (type_, i))
  File "build/bdist.linux-i686/egg/trac/web/api.py", line 216, in __getattr__
    value = self.callbacks[name](self)
  File "build/bdist.linux-i686/egg/trac/web/main.py", line 300, in _get_session
    return Session(self.env, req)
  File "build/bdist.linux-i686/egg/trac/web/session.py", line 198, in __init__
    self.get_session(sid)
  File "build/bdist.linux-i686/egg/trac/web/session.py", line 219, in get_session
    super(Session, self).get_session(sid, authenticated)
  File "build/bdist.linux-i686/egg/trac/web/session.py", line 70, in get_session
    """, (sid, int(authenticated)))
  File "build/bdist.linux-i686/egg/trac/db/util.py", line 65, in execute
    return self.cursor.execute(sql_escape_percent(sql), args)
  File "build/bdist.linux-i686/egg/trac/db/sqlite_backend.py", line 78, in execute
    result = PyFormatCursor.execute(self, *args)
  File "build/bdist.linux-i686/egg/trac/db/sqlite_backend.py", line 56, in execute
    args or [])
  File "build/bdist.linux-i686/egg/trac/db/sqlite_backend.py", line 48, in _rollback_on_error
    return function(self, *args, **kwargs)
OperationalError: unable to open database file