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Attempt to invoke virtual method 'java.lang.Class java.lang.Object.getClass()' on a null object reference
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(BackStackRecord.java:418) at android.support.v4.app.BackStackRecord.add(BackStackRecord.java:408) at com.psycho.ayush.sahanubhooti_20.MainActivity$1.onClick(MainActivity.java:30) at android.view.View.performClick(View.java:4756) at android.view.View$PerformClick.run(View.java:19761) at android.os.Handler.handleCallback(Handler.java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:135) at android.app.ActivityThread.main(ActivityThread.java:5253) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)