java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.LinearLayout.setLayoutTransition(android.animation.LayoutTransition)' on a null object reference

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    Root Cause Analysis

    1. java.lang.NullPointerException

      Attempt to invoke virtual method 'void android.widget.LinearLayout.setLayoutTransition(android.animation.LayoutTransition)' on a null object reference

      at com.daveslab.wideview.MainActivity.onCreateOptionsMenu()
    2. com.daveslab.wideview
      MainActivity.onCreateOptionsMenu
      1. com.daveslab.wideview.MainActivity.onCreateOptionsMenu(MainActivity.java:69)
      1 frame
    3. Android Platform
      Activity.onCreatePanelMenu
      1. android.app.Activity.onCreatePanelMenu(Activity.java:2846)
      1 frame
    4. Android Support v4
      FragmentActivity.onCreatePanelMenu
      1. android.support.v4.app.FragmentActivity.onCreatePanelMenu(FragmentActivity.java:360)
      1 frame
    5. Android v7
      ToolbarActionBar$1.run
      1. android.support.v7.view.WindowCallbackWrapper.onCreatePanelMenu(WindowCallbackWrapper.java:88)
      2. android.support.v7.app.AppCompatDelegateImplBase$AppCompatWindowCallbackBase.onCreatePanelMenu(AppCompatDelegateImplBase.java:331)
      3. android.support.v7.view.WindowCallbackWrapper.onCreatePanelMenu(WindowCallbackWrapper.java:88)
      4. android.support.v7.app.ToolbarActionBar.populateOptionsMenu(ToolbarActionBar.java:454)
      5. android.support.v7.app.ToolbarActionBar$1.run(ToolbarActionBar.java:61)
      5 frames
    6. Android Platform
      ActivityThread.main
      1. android.os.Handler.handleCallback(Handler.java:739)
      2. android.os.Handler.dispatchMessage(Handler.java:95)
      3. android.os.Looper.loop(Looper.java:148)
      4. android.app.ActivityThread.main(ActivityThread.java:5417)
      4 frames
    7. Java RT
      Method.invoke
      1. java.lang.reflect.Method.invoke(Native Method)
      1 frame
    8. Android
      ZygoteInit.main
      1. com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
      2. com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
      2 frames