小程序引入插件报错

[non-writable] modification of global variable “App” is not allowed when using plugins at app.json.

[non-writable] modification of global variable “Page” is not allowed when using plugins at app.json.

项目引入了“极点日历”插件，引入之后就报这两个错误，但是插件还正常使用，请问这个错误是什么引起的