Game end error

[uakfdotb]

Traceback (most recent call last):
File "/usr/local/lib/python2.7/dist-packages/engineio/server.py", line 405, in _trigger_event
return self.handlersevent
File "/usr/local/lib/python2.7/dist-packages/socketio/server.py", line 520, in _handle_eio_message
self._handle_event(sid, pkt.namespace, pkt.id, pkt.data)
File "/usr/local/lib/python2.7/dist-packages/socketio/server.py", line 456, in _handle_event
self._handle_event_internal(self, sid, data, namespace, id)
File "/usr/local/lib/python2.7/dist-packages/socketio/server.py", line 459, in _handle_event_internal
r = server._trigger_event(data[0], namespace, sid, *data[1:])
File "/usr/local/lib/python2.7/dist-packages/socketio/server.py", line 488, in _trigger_event
return self.handlers[namespace]event
File "server.py", line 174, in func_wrapper
func(users[sid], *args)
File "server.py", line 225, in func_wrapper
func(user.game_player, *args)
File "server.py", line 240, in func_wrapper
func(game_player.game.round, game_player.idx, *args)
File "server.py", line 267, in round_play
r.play(player, cards)
File "/home/ubuntu/tractor/server/model.py", line 414, in play
self._end()
File "/home/ubuntu/tractor/server/model.py", line 455, in _end
self._fire(lambda listener: listener.end(self, player_scores, 0))
File "/home/ubuntu/tractor/server/model.py", line 331, in _fire
f(listener)
File "/home/ubuntu/tractor/server/model.py", line 455, in
self._fire(lambda listener: listener.end(self, player_scores, 0))
AttributeError: 'Game' object has no attribute 'end'