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java.lang.NullPointerException: 	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 android.support.v4.view.ViewPager.populate(ViewPager.java:1235)	at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:666)	at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:628)	at android.support.v4.view.ViewPager.dataSetChanged(ViewPager.java:1077)	at android.support.v4.view.ViewPager$PagerObserver.onChanged(ViewPager.java:3060)	at android.support.v4.view.PagerAdapter.notifyDataSetChanged(PagerAdapter.java:284)	at com.umeugwaDabeluchi.Ume.Fragments.EditFile.OnFileReady(EditFile.java:62)	at com.umeugwaDabeluchi.Ume.Utility.DataManager$2.run(DataManager.java:204)	at android.os.Handler.handleCallback(Handler.java:733)	at android.os.Handler.dispatchMessage(Handler.java:95)	at android.os.Looper.loop(Looper.java:146)	at android.app.ActivityThread.main(ActivityThread.java:5635)	at java.lang.reflect.Method.invokeNative(Native Method)	at java.lang.reflect.Method.invoke(Method.java:515)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1291)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1107)	at dalvik.system.NativeStart.main(Native Method)