java.lang.NullPointerException: Attempt to invoke virtual method 'void com.facebook.ads.internal.DisplayAdController.c()' on a null object reference

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    Root Cause Analysis

    1. java.lang.NullPointerException

      Attempt to invoke virtual method 'void com.facebook.ads.internal.DisplayAdController.c()' on a null object reference

      at com.facebook.ads.InterstitialAd.show()
    2. com.facebook.ads
      InterstitialAd.show
      1. com.facebook.ads.InterstitialAd.show(Unknown Source)
      1 frame
    3. com.appster.map
      MapActivity$1.run
      1. com.appster.map.MapActivity$1.run(MapActivity.java:161)
      1 frame
    4. Android Platform
      ActivityThread.main
      1. android.os.Handler.handleCallback(Handler.java:739)
      2. android.os.Handler.dispatchMessage(Handler.java:95)
      3. android.os.Looper.loop(Looper.java:148)
      4. android.app.ActivityThread.main(ActivityThread.java:5551)
      4 frames
    5. Java RT
      Method.invoke
      1. java.lang.reflect.Method.invoke(Method.java)
      1 frame
    6. Android
      ZygoteInit.main
      1. com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:730)
      2. com.android.internal.os.ZygoteInit.main(ZygoteInit.java:620)
      2 frames