导入项目错误（二）Project '项目xxx' is missing required library:

Mac导入以前Windows上面的项目demo，报如下错误：

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   

解决方式：

1、删除项目工程下.metadata文件，Eclipse重新导入项目

2、删除带红叉的jar包

Java Build Path，Libraries，选中报错的jar包remove删除，ok!