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Attempt to invoke virtual method 'android.os.Handler android.support.v4.app.FragmentHostCallback.getHandler()' on a null object reference
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Attempt to invoke virtual method 'android.os.Handler android.support.v4.app.FragmentHostCallback.getHandler()' on a null object reference
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Attempt to invoke virtual method 'android.os.Handler android.support.v4.app.FragmentHostCallback.getHandler()' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'android.os.Handler android.support.v4.app.FragmentHostCallback.getHandler()' on a null object reference	at android.support.v4.app.FragmentManagerImpl.execSingleAction(FragmentManager.java:1623)	at android.support.v4.app.BackStackRecord.commitNowAllowingStateLoss(BackStackRecord.java:637)	at android.support.v4.app.FragmentStatePagerAdapter.finishUpdate(FragmentStatePagerAdapter.java:166)	at com.inheadline.news.view.viewpager.VerticalViewPager.setAdapter(VerticalViewPager.java:278)	at com.inheadline.news.activity.MainActivity.setupViewPager(MainActivity.java:487)	at com.inheadline.news.activity.MainActivity.dataAdded(MainActivity.java:557)	at com.inheadline.news.db.operation.DataSnapshotToDb$AddToDb.onPostExecute(DataSnapshotToDb.java:163)	at com.inheadline.news.db.operation.DataSnapshotToDb$AddToDb.onPostExecute(DataSnapshotToDb.java:138)	at android.os.AsyncTask.finish(AsyncTask.java:679)	at android.os.AsyncTask.access$500(AsyncTask.java:180)	at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:696)	at android.os.Handler.dispatchMessage(Handler.java:102)	at android.os.Looper.loop(Looper.java:150)	at android.app.ActivityThread.main(ActivityThread.java:5546)	at java.lang.reflect.Method.invoke(Method.java)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:794)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:684)