java.lang.NullPointerException: This exception has no message.

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Samebug tips

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Expert tip

Check if you imported android.support.v4.app.FragmentManager and not android.app.FragmentManager. Check for naming problems in your xml files as well, might have inconsistencies!

,
Expert tip

Also, check if you're not using android.support.v4.app.FragmentTransaction with android.app.Fragment, as they're not totally compatible.

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This exception has no message.
java.lang.NullPointerException:
at android.support.v4.app.BackStackRecord.doAddOp(BackStackRecord.java:418)
at android.support.v4.app.BackStackRecord.add(BackStackRecord.java:413)
at android.support.v4.app.FragmentPagerAdapter.instantiateItem(FragmentPagerAdapter.java:103)
at android.support.v4.view.ViewPager.addNewItem(ViewPager.java:1003)
at android.support.v4.view.ViewPager.populate(ViewPager.java:1151)
at android.support.v4.view.ViewPager.populate(ViewPager.java:1085)
at android.view.View.measure(View.java:17331)
at android.support.design.widget.CoordinatorLayout.onMeasureChild(CoordinatorLayout.java:671)
at android.support.design.widget.HeaderScrollingViewBehavior.onMeasureChild(HeaderScrollingViewBehavior.java:90)
at android.support.design.widget.AppBarLayout$ScrollingViewBehavior.onMeasureChild(AppBarLayout.java:1319)
at android.support.design.widget.CoordinatorLayout.onMeasure(CoordinatorLayout.java:736)
at android.view.View.measure(View.java:17331)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5376)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at android.view.View.measure(View.java:17331)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5376)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1410)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
at android.view.View.measure(View.java:17331)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5376)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at android.view.View.measure(View.java:17331)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5376)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1410)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
at android.view.View.measure(View.java:17331)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5376)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at android.view.View.measure(View.java:17331)
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2279)
at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1393)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1592)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1251)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6540)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:813)
at android.view.Choreographer.doCallbacks(Choreographer.java:613)
at android.view.Choreographer.doFrame(Choreographer.java:583)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:799)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:146)
at android.app.ActivityThread.main(ActivityThread.java:5593)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)

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