How to fix "Found 2 versions of android-support-v4.jar in the dependency list"

Recently after updated SDK on Android-Eclipse, tried to import my old example, and have the following error reported:

Found 2 versions of android-support-v4.jar in the dependency list,
but not all the versions are identical (check is based on SHA-1 only at this time).
...

My solution is to delete the file android-support-v4.jar in libs folder of my project.