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java.lang.NullPointerException: 	at android.support.v7.widget.RecyclerView.computeVerticalScrollRange(SourceFile:1654)	at android.view.View.onDrawScrollBars(View.java:12160)	at android.view.View.draw(View.java:14742)	at android.support.v7.widget.RecyclerView.draw(SourceFile:3097)	at android.view.View.getDisplayList(View.java:13588)	at android.view.View.getDisplayList(View.java:13635)	at android.view.View.draw(View.java:14430)	at android.view.ViewGroup.drawChild(ViewGroup.java:3252)	at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3070)	at android.view.View.draw(View.java:14739)	at android.view.View.getDisplayList(View.java:13588)	at android.view.View.getDisplayList(View.java:13635)	at android.view.View.draw(View.java:14430)	at android.view.ViewGroup.drawChild(ViewGroup.java:3252)	at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3070)	at android.view.View.draw(View.java:14739)	at android.widget.FrameLayout.draw(FrameLayout.java:534)