Cannot find the class file for java.lang.Object

Question

I reinstalled my eclipse. and then imported all the projects in the Eclipse, but every project has a common error:

Cannot find the class file for java.lang.Object.

Answer 1

This error is because one of "Android Private Libraries" is either corrupted or of wrong version. In my case it was android-support-v4.jar. I replaced it with one from a working project and it works.