Android studio unresolved class 错误怎么解决

求助各位大佬,我打开一个工程的时候(在我同学那是能跑的)manifest文件出现很多unresolved class'xxx' 的错误,是环境有问题吗?
比如有一行是Android:name="com.example.application.MyApplication"提示unresolved class'MyApplication'

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c++组建错误fatal error LNK1120: 1 unresolved externals
![图片说明](https://img-ask.csdn.net/upload/201605/04/1462369690_230367.png) ![图片说明](https://img-ask.csdn.net/upload/201605/04/1462369698_617083.png)
Unresolved compilation problem:
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