java.lang.NullPointerException: Attempt to invoke interface method 'int android.app.FragmentManager$BackStackEntry.getId()' on a null object reference

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    NullPointerException: Attempt to invoke interface method on a null object reference

    Stack Overflow | 2 weeks ago | ThatProgrammerAndroid222222222
    java.lang.NullPointerException: Attempt to invoke interface method 'int android.app.FragmentManager$BackStackEntry.getId()' on a null object reference
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    java.lang.NullPointerException: Attempt to invoke virtual method 'android.support.v4.app.FragmentTransaction android.support.v4.app.FragmentManager.beginTransaction()' on a null object reference
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    Xamarin Android - Using FragmentTabHost in a Fragment

    codegur.net | 1 year ago
    java.lang.NullPointerException: Attempt to invoke virtual method 'android.support.v4.app.FragmentTransaction android.support.v4.app.FragmentManager.beginTransaction()' on a null object reference
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    Stack Overflow | 1 year ago | jobin
    java.lang.NullPointerException: Attempt to invoke virtual method 'android.support.v4.app.FragmentTransaction android.support.v4.app.FragmentManager.beginTransaction()' on a null object reference

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    Root Cause Analysis

    1. java.lang.NullPointerException

      Attempt to invoke interface method 'int android.app.FragmentManager$BackStackEntry.getId()' on a null object reference

      at co5025.example.com.week10.MainActivity.onClick()
    2. co5025.example.com
      MainActivity.onClick
      1. co5025.example.com.week10.MainActivity.onClick(MainActivity.java:52)
      1 frame
    3. Android Platform
      ActivityThread.main
      1. android.view.View.performClick(View.java:5610)
      2. android.view.View$PerformClick.run(View.java:22260)
      3. android.os.Handler.handleCallback(Handler.java:751)
      4. android.os.Handler.dispatchMessage(Handler.java:95)
      5. android.os.Looper.loop(Looper.java:154)
      6. android.app.ActivityThread.main(ActivityThread.java:6077)
      6 frames
    4. Java RT
      Method.invoke
      1. java.lang.reflect.Method.invoke(Native Method)
      1 frame
    5. Android
      ZygoteInit.main
      1. com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
      2. com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
      2 frames