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I got this error by using the ViewPager in the Android Support package . from the Horizontal View Swiping with ViewPager Tutorial 06-19 13:07:25.950: E/AndroidRuntime(16382): FATAL EXCEPTION: main 06-19 13:07:25.950: E/AndroidRuntime(16382): java.lang.NullPointerException 06-19 13:07:25.950: E/AndroidRuntime(16382): at android.support.v4.app.BackStackRecord.doAddOp(BackStackRecord.java:347) 06-19 13:07:25.950: E/AndroidRuntime(16382): at android.support.v4.app.BackStackRecord.add(BackStackRecord.java:342) 06-19 13:07:25.950: E/AndroidRuntime(16382): at android.support.v4.app.FragmentPagerAdapter.instantiateItem(FragmentPagerAdapter.java:97) 06-19 13:07:25.950: E/AndroidRuntime(16382): at android.support.v4.view.ViewPager.addNewItem(ViewPager.java:649) 06-19 13:07:25.950: E/AndroidRuntime(16382): at android.support.v4.view.ViewPager.populate(ViewPager.java:783) 06-19 13:07:25.950: E/AndroidRuntime(16382): at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1016) 06-19 13:07:25.950: E/AndroidRuntime(16382): at android.view.View.measure(View.java:12728) 06-19 13:07:25.950: E/AndroidRuntime(16382): at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:594) 06-19 13:07:25.950: E/AndroidRuntime(16382): at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:376) 06-19 13:07:25.950: E/AndroidRuntime(16382): at android.view.View.measure(View.java:12728) 06-19 13:07:25.950: E/AndroidRuntime(16382): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4698) 06-19 13:07:25.950: E/AndroidRuntime(16382): at android.widget.FrameLayout.onMeasure(FrameLayout.java:293) 06-19 13:07:25.950: E/AndroidRuntime(16382): at android.view.View.measure(View.java:12728) 06-19 13:

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