// java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v4.app.Fragment.setMenuVisibility(boolean)' on a null object reference
// at android.support.v4.app.FragmentStatePagerAdapter.instantiateItem(FragmentStatePagerAdapter.java:120)
// at android.support.v4.view.ViewPager.addNewItem(ViewPager.java:1034)
// at android.support.v4.view.ViewPager.populate(ViewPager.java:1182)
// at android.support.v4.view.ViewPager.populate(ViewPager.java:1116)
// at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1642)
// at android.view.View.measure(View.java:18794)
// at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)
// at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)
// at android.view.View.measure(View.java:18794)
// at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)
// at android.support.design.widget.CoordinatorLayout.onMeasureChild(CoordinatorLayout.java:714)
// at android.support.design.widget.HeaderScrollingViewBehavior.onMeasureChild(HeaderScrollingViewBehavior.java:90)
// at android.support.design.widget.AppBarLayout$ScrollingViewBehavior.onMeasureChild(AppBarLayout.java:1391)
// at android.support.design.widget.CoordinatorLayout.onMeasure(CoordinatorLayout.java:784)
// at android.view.View.measure(View.java:18794)
// at android.support.v4.widget.DrawerLayout.onMeasure(DrawerLayout.java:1081)
// at android.view.View.measure(View.java:18794)
// at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)
// at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)
// at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:139)
// at android.view.View.measure(View.java:18794)
// at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)
// at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)
// at android.view.View.measure(View.java:18794)
// at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)
// at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)
// at android.view.View.measure(View.java:18794)
// at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)
// at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1465)
// at android.widget.LinearLayout.measureVertical(LinearLayout.java:748)
// at android.widget.LinearLayout.onMeasure(LinearLayout.java:630)
// at android.view.View.measure(View.java:18794)
// at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)
// at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)
// at com.android.internal.policy.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2643)
// at android.view.View.measure(View.java:18794)
// at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2100)
// at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1216)
// at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1452)
// at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1107)
// at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6013)
// at android.view.Choreographer$CallbackRecord.run(Choreographer.java:858)
// at android.view.Choreographer.doCallbacks(Choreographer.java:670)
// at android.view.Choreographer.doFrame(Choreographer.java:606)
// at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:844)
// at android.os.Handler.handleCallback(Handler.java:739)
// at android.os.Handler.dispatchMessage(Handler.java:95)
// at android.os.Looper.loop(Looper.java:148)
// at android.app.ActivityThread.main(ActivityThread.java:5417)
// at java.lang.reflect.Method.invoke(Native Method)
// at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
// at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)