java.lang.NullPointerException

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  • java.lang.NullPointerException: Attempt to invoke interface method 'int android.app.FragmentManager$BackStackEntry.getId()' on a null object reference at co5025.example.com.week10.MainActivity.onClick(MainActivity.java:52) at android.view.View.performClick(View.java:5610) at android.view.View$PerformClick.run(View.java:22260) at android.os.Handler.handleCallback(Handler.java:751) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:6077) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
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