The project was not built since its build path is incomplete. Cannot find the class file for java.la

最近把以前windows上的android的代码都放到移动硬盘，然后在mac上运行，因以前都是eclipse开发， 费了半天劲（谷歌不维护了、公司网速慢）弄好了mac版的eclipse 导入代码到eclipse 结果出现下面的错误： The project was not built since its build path is incomplete. Cannot find the class

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