Crouton depends on libraries but is not a library itself
This issue due to com.android.support-v4 recent update. So I changed compile ‘com.android.support:support-v4:20.+’ to compile ‘com.android.support:support-v4:19.1.+’ and crouton works fine Different workaround is to use @aar: compile(‘de.keyboardsurfer.android.widget:crouton:1.8.4@aar’) { exclude group: ‘com.google.android’, module: ‘support-v4’ }