Fixed my issue by changing these
compile 'com.android.support:cardview-v7:21.0.+'
compile 'com.android.support:recyclerview-v7:21.0.+'
to
compile 'com.android.support:cardview-v7:23.0.+'
compile 'com.android.support:recyclerview-v7:23.0.+'
that means your target SDK version should be same as version of cardView and recyclerView and other google libraries.
targetSdkVersion 23