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java.lang.NullPointerException: 	at android.support.v7.widget.RecyclerView.computeVerticalScrollRange(RecyclerView.java:1216)	at android.view.View.onDrawScrollBars(View.java:12943)	at android.view.View.draw(View.java:15237)	at android.support.v7.widget.RecyclerView.draw(RecyclerView.java:2440)	at android.view.View.draw(View.java:15140)	at android.view.ViewGroup.drawChild_Original(ViewGroup.java:3405)	at android.view.ViewGroup_Delegate.drawChild(ViewGroup_Delegate.java:53)	at android.view.ViewGroup.drawChild(ViewGroup.java:3405)	at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3198)	at android.view.View.draw(View.java:15138)	at android.view.ViewGroup.drawChild_Original(ViewGroup.java:3405)	at android.view.ViewGroup_Delegate.drawChild(ViewGroup_Delegate.java:53)	at android.view.ViewGroup.drawChild(ViewGroup.java:3405)	at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3198)	at android.view.View.draw(View.java:15234)	at android.view.View.draw(View.java:15140)	at android.view.ViewGroup.drawChild_Original(ViewGroup.java:3405)	at android.view.ViewGroup_Delegate.drawChild(ViewGroup_Delegate.java:53)	at android.view.ViewGroup.drawChild(ViewGroup.java:3405)	at android.support.v4.widget.DrawerLayout.drawChild(DrawerLayout.java:1086)	at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3198)	at android.view.View.draw(View.java:15138)	at android.view.ViewGroup.drawChild_Original(ViewGroup.java:3405)	at android.view.ViewGroup_Delegate.drawChild(ViewGroup_Delegate.java:53)	at android.view.ViewGroup.drawChild(ViewGroup.java:3405)	at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3198)	at android.view.View.draw(View.java:15138)	at android.view.ViewGroup.drawChild_Original(ViewGroup.java:3405)	at android.view.ViewGroup_Delegate.drawChild(ViewGroup_Delegate.java:53)	at android.view.ViewGroup.drawChild(ViewGroup.java:3405)	at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3198)	at android.view.View.draw(View.java:15234)	at android.view.View.draw(View.java:15140)	at android.view.ViewGroup.drawChild_Original(ViewGroup.java:3405)	at android.view.ViewGroup_Delegate.drawChild(ViewGroup_Delegate.java:53)	at android.view.ViewGroup.drawChild(ViewGroup.java:3405)	at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3198)	at android.view.View.draw(View.java:15234)