在行动电缆轨道中获得错误5

Question

我在game.coffe文件中写下以下代码

App.game = App.cable.subscriptions.create "GameChannel",
  connected: ->
   ...

  disconnected: ->
   ...
  received: (data) ->
    switch data.action
      when "game_start"
        $('#status').html("Player found")
        App.gamePlay = new Game('#game-container', data.msg)

      when "take_turn"
        App.gamePlay.move data.move
        App.gamePlay.getTurn()

      when "new_game"
        App.gamePlay.newGame()

      when "opponent_withdraw"
        $('#status').html("Opponent withdraw, You win!")
        $('#new-match').removeClass('hidden');

  take_turn: (move) ->
    @perform 'take_turn', data: move

  new_game: () ->
    @perform 'new_game'

当我在浏览器中运行此代码时，它会向我显示这样的错误

game.self-9aed049….js?body=1:42 Uncaught ReferenceError: Game is not defined

在浏览器的控制台中。