[Error]Found 2 versions of android-support-v4.jar in the dependency list

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 thistime).
All versions of the libraries must be the same at this time.

Versions found are:

Path: C:\work\Test\libs\
        android-support-v4.jar
        Length: 385685
        SHA-1: 48c94ae70fa65718b382098237806a5909bb096e

Path:
C:\work\Chat\libs\
        android-support-v4.jar
        Length: 349252
        SHA-1: 612846c9857077a039b533718f72db3bc041d389

Jar mismatch! Fix your dependencies

[Error] the import android.support.v7.app cannot be resolved

有時候在新增一個Android專案後會出現類似的問題
the import android.support.v7.app cannot be resolved