Google apps script Google脚本CardService.newButtonStation（）正在变为null

在附加到Google电子表格的脚本中，我有一个用于启动/停止脚本的自定义菜单项。根据存储在别处的实际状态，我希望更改提示窗口。一个问题是，

CardService.newbuttstation（）

似乎正在变为null，因此添加按钮会导致错误

  var state = true //Comes from DocumentProperties
  var onButton = CardService.newTextButton().setText("Spustit")
  var offButton = CardService.newTextButton().setText("Pozastavit")
  var cancelButton = ui.Button.CANCEL
  var buttonSet

  if (state == "true"){
    msg = "Do you want to stop the scripts?"
    title = "Automatic update is on"
    // Here I get the error: "Cannot find method addButton(Button)"
    buttonSet = CardService.newButtonSet().addButton(offButton).addButton(cancelButton)
  } else if (state == "false"){
    msg = "Do you want allow the scripts"
    title = "Automatic update is off"
    buttonSet = CardService.newButtonSet().addButton(onButton).addButton(cancelButton)
  } else {
    msg = "Do you want to switch automation on or off?"
    title = "Automation"
    buttonSet = CardService.newButtonSet().addButton(onButton).addButton(offButton).addButton(cancelButton)
  }

你有提示吗，怎么了？

来自

目前，您只能使用此服务构建Gmail附加组件

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非常感谢。我没想到原因这么简单。@JTV请结帐