unity插件导入Sirenix插件异常

从旧项目打包导入进来一个Sirenix(编辑器插件)，结果打包的时候报了个异常，有没有遇到相同问题的帮忙指导一下，万分感谢！详情请看下图

试试
To resolve this error, complete the following steps:

1.Upgrade to the Unity Mediation SDK 0.2.0 or later, and then close your project.
2.Delete the Assets/PlayServicesResolver folder in your project.
3.Reopen your project, and you will be prompted to install a version of PlayServicesResolver that is provided with the Mediation package. Install this version of the PlayServicesResolver.