java.lang.NullPointerException

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  • java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.View android.view.View.findViewById(int)' on a null object reference at youtube.demo.youtubedemo.Fragments.Calculator_list.Calculator_list.onCreate(Calculator_list.java:47) at android.app.Fragment.performCreate(Fragment.java:2335) at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:949) at android.app.BackStackRecord.setLastIn(BackStackRecord.java:857) at android.app.BackStackRecord.calculateFragments(BackStackRecord.java:897) at android.app.BackStackRecord.run(BackStackRecord.java:727) at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1578) at android.app.FragmentManagerImpl$1.run(FragmentManager.java:483) at android.os.Handler.handleCallback(Handler.java:751) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:6077) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
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