Android bug fix and Admob - Project for Wein

I need some one to quick fix my android studio code and integrate admob, it's crashing mainly in android mars2mallow version 6 saying unfortunately app has stopped. You need to make it ready for any android version BUG FREE. Currently I have - android:minSdkVersion="11" android:targetSdkVersion="21" I got this error from crash log - unsupportedOperationException [login to view URL] You need to specifically mention what change you have done to fix bug so that I can understand and do it in prime version code myself.