• Cannot add menu item 'GameObject/UI/Event System' for method 'MenuOptions.CreateEventSystem' because a menu item with the same name already exists.

重启unity，警告消失

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重启unity，Networking.dll 以及 UnityEngineUI.dll的报错也消失

• UnusedBytecodeStripper2.exe did not run properly!

删除link.xml文件（该文件是Vuforia附带的，换了sdk，没删干净。。），问题解决。

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• Vuforia cannot be started before it is initialized.
  Please disable Delayed Initializationin the Vuforia configuration or initialize Vuforia manually with the VuforiaRuntime-class.

重启unity，就正常了