java.lang.IllegalStateException

android.app.Activity.onCreate

java.lang.RuntimeException:
  at android.app.ActivityThread.performLaunchActivity (ActivityThread.java:2957)
  at android.app.ActivityThread.handleLaunchActivity (ActivityThread.java:3032)
  at android.app.ActivityThread.-wrap11 (Unknown Source)
  at android.app.ActivityThread$H.handleMessage (ActivityThread.java:1696)
  at android.os.Handler.dispatchMessage (Handler.java:105)
  at android.os.Looper.loop (Looper.java:164)
  at android.app.ActivityThread.main (ActivityThread.java:6944)
  at java.lang.reflect.Method.invoke (Native Method)
  at com.android.internal.os.Zygote$MethodAndArgsCaller.run (Zygote.java:327)
  at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1374)
Caused by: java.lang.IllegalStateException:
  at android.app.Activity.onCreate (Activity.java:1038)
  at com.google.android.gms.ads.AdActivity.onCreate (Unknown Source)
  at android.app.Activity.performCreate (Activity.java:7174)
  at android.app.Instrumentation.callActivityOnCreate **(Instrumentation.java:1220)**
  at android.app.ActivityThread.performLaunchActivity (ActivityThread.java:2910)