Gradle Failed To Refresh

Everytime I try to add, compile 'com.soundcloud.android:android-crop:1.0.0@aar' I get the following error Error:Timeout waiting to lock buildscript class cache for build file 'C:\U

Solution 1:

clear your gradle cache -> delete the whole .gradle folder -> project directory. don't worry it will be recreated. The same is for .gradle -> home directory.

you can also go to File -> Invalidate ->Caches/Restart.