java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at com.android.internal.app.AlertController.setupContent(AlertController.java:503)
at com.android.internal.app.AlertController.setupView(AlertController.java:396)
at android.app.AlertDialog.onCreate(AlertDialog.java:338)
at android.app.Dialog.dispatchOnCreate(Dialog.java:364)
at android.app.Dialog.show(Dialog.java:265)
at android.app.AlertDialog$Builder.show(AlertDialog.java:956)
at com.execute.lightly.FullscreenActivity$1.onFinish(FullscreenActivity.java:145)
at android.os.CountDownTimer$1.handleMessage(CountDownTimer.java:118)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:146)
at android.app.ActivityThread.main(ActivityThread.java:5602)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)

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