導入項目錯誤（二）Project '項目xxx' is missing required library:

Mac導入以前Windows上面的項目demo，報如下錯誤：

Project '0101_lenovomall_UpdateApp' is missing required library: 'D:/yyh_installSoft/androidTools/android_lianXiangLT_shenHua/adt-bundle-windows-x86-20140702/sdk/platforms/android-21/android.jar’

The project cannot be built until build path errors are resolved   

解決方式：

1、刪除項目工程下.metadata文件，Eclipse重新導入項目

2、刪除帶紅叉的jar包

Java Build Path，Libraries，選中報錯的jar包remove刪除，ok!