java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.View android.view.Window.findViewById(int)' on a null object reference

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Root Cause Analysis

  1. java.lang.NullPointerException

    Attempt to invoke virtual method 'android.view.View android.view.Window.findViewById(int)' on a null object reference

    at android.app.Activity.findViewById()
  2. Android Platform
    Activity.findViewById
    1. android.app.Activity.findViewById(Activity.java:2090)
    1 frame