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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.support.v4.view.ViewPager.onMeasure(ViewPager.java:1611) at android.view.View.measure(View.java:17331) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5376) 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$ScrollingViewBehavior.onMeasureChild(AppBarLayout.java:1319) at android.support.design.widget.CoordinatorLayout.onMeasure(CoordinatorLayout.java:736) at android.view.View.measure(View.java:17331) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5376) at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:135) at android.view.View.measure(View.java:17331) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5376) at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1410) at android.widget.LinearLayout.measureVertical(LinearLayout.java:695) at android.widget.LinearLayout.onMeasure(LinearLayout.java:588) at android.view.View.measure(View.java:17331) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5376) at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) at android.view.View.measure(View.java:17331) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5376) at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1410) at android.widget.LinearLayout.measureVertical(LinearLayout.java:695) at android.widget.LinearLayout.onMeasure(LinearLayout.java:588) at android.view.View.measure(View.java:17331) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5376) at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2548) 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) at dalvik.system.NativeStart.main(Native Method)