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的代碼都放到移動硬盤，然後在mac上運行，因以前都是eclipse開發， 費了半天勁（谷歌不維護了、公司網速慢）弄好了mac版的eclipse 導入代碼到eclipse 結果出現下面的錯誤： The project was not built since its build path is incomplete. Cannot find the class

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