java.lang.NullPointerException: Attempt to write to field 'android.support.v4.app.FragmentManagerImpl android.support.v4.app.Fragment.mFragmentManager' on a null object reference

Stack Overflow | Ayush | 4 months ago
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    Stack Overflow | 4 months ago | Ayush
    java.lang.NullPointerException: Attempt to write to field 'android.support.v4.app.FragmentManagerImpl android.support.v4.app.Fragment.mFragmentManager' on a null object reference
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    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.zootypers/com.example.zootypers.ui.LeaderboardUI}: java.lang.NullPointerException
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    java.lang.NullPointerException: Attempt to write to field 'android.support.v4.app.FragmentManagerImpl android.support.v4.app.Fragment.mFragmentManager' on a null object reference

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    Root Cause Analysis

    1. java.lang.NullPointerException

      Attempt to write to field 'android.support.v4.app.FragmentManagerImpl android.support.v4.app.Fragment.mFragmentManager' on a null object reference

      at android.support.v4.app.BackStackRecord.doAddOp()
    2. Android Support v4
      BackStackRecord.add
      1. android.support.v4.app.BackStackRecord.doAddOp(BackStackRecord.java:418)
      2. android.support.v4.app.BackStackRecord.add(BackStackRecord.java:408)
      2 frames
    3. com.psycho.ayush
      MainActivity$1.onClick
      1. com.psycho.ayush.sahanubhooti_20.MainActivity$1.onClick(MainActivity.java:30)
      1 frame
    4. Android Platform
      ActivityThread.main
      1. android.view.View.performClick(View.java:4756)
      2. android.view.View$PerformClick.run(View.java:19761)
      3. android.os.Handler.handleCallback(Handler.java:739)
      4. android.os.Handler.dispatchMessage(Handler.java:95)
      5. android.os.Looper.loop(Looper.java:135)
      6. android.app.ActivityThread.main(ActivityThread.java:5253)
      6 frames
    5. Java RT
      Method.invoke
      1. java.lang.reflect.Method.invoke(Native Method)
      2. java.lang.reflect.Method.invoke(Method.java:372)
      2 frames
    6. Android
      ZygoteInit.main
      1. com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
      2. com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
      2 frames