java.lang.RuntimeException: Unable to resume activity {me.onenrico.paypalbalance/me.onenrico.paypalbalance.activity.ConfigurationActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.google.android.gms.ads.AdView.setAdListener(com.google.android.gms.ads.AdListener)' on a null object reference
	at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3824)
	at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3856)
	at android.app.servertransaction.ResumeActivityItem.execute(ResumeActivityItem.java:51)
	at android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:145)
	at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:70)
	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1831)
	at android.os.Handler.dispatchMessage(Handler.java:106)
	at android.os.Looper.loop(Looper.java:201)
	at android.app.ActivityThread.main(ActivityThread.java:6806)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:873)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.google.android.gms.ads.AdView.setAdListener(com.google.android.gms.ads.AdListener)' on a null object reference
	at me.onenrico.paypalbalance.activity.ConfigurationActivity.onResume(ConfigurationActivity.java:74)
	at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1413)
	at android.app.Activity.performResume(Activity.java:7400)
	at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3816)
	... 11 more