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java.lang.NullPointerException: 	at android.support.v7.widget.RecyclerView.computeVerticalScrollRange(RecyclerView.java:1654)	at android.view.View.onDrawScrollBars(View.java:11439)	at android.view.View.draw(View.java:13718)	at android.support.v7.widget.RecyclerView.draw(RecyclerView.java:3097)	at android.view.View.draw(View.java:13596)	at android.view.ViewGroup.drawChild(ViewGroup.java:2928)	at android.support.v4.widget.DrawerLayout.drawChild(DrawerLayout.java:1229)	at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2797)	at android.view.View.draw(View.java:13594)	at android.view.ViewGroup.drawChild(ViewGroup.java:2928)	at android.support.design.widget.CoordinatorLayout.drawChild(CoordinatorLayout.java:1077)	at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2797)	at android.view.View.draw(View.java:13594)	at android.view.ViewGroup.drawChild(ViewGroup.java:2928)	at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2797)	at android.view.View.draw(View.java:13715)	at android.widget.FrameLayout.draw(FrameLayout.java:467)	at android.view.View.draw(View.java:13596)	at android.view.ViewGroup.drawChild(ViewGroup.java:2928)	at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2797)	at android.view.View.draw(View.java:13715)	at android.support.v7.widget.ActionBarOverlayLayout.draw(ActionBarOverlayLayout.java:442)	at android.view.View.draw(View.java:13596)	at android.view.ViewGroup.drawChild(ViewGroup.java:2928)	at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2797)	at android.view.View.draw(View.java:13594)	at android.view.ViewGroup.drawChild(ViewGroup.java:2928)	at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2797)	at android.view.View.draw(View.java:13594)	at android.view.ViewGroup.drawChild(ViewGroup.java:2928)	at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2797)	at android.view.View.draw(View.java:13715)	at android.widget.FrameLayout.draw(FrameLayout.java:467)	at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:2211)	at android.view.ViewRootImpl.drawSoftware(ViewRootImpl.java:2281)	at android.view.ViewRootImpl.draw(ViewRootImpl.java:2177)	at android.view.ViewRootImpl.performDraw(ViewRootImpl.java:2045)	at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1854)	at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:989)	at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4351)	at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)	at android.view.Choreographer.doCallbacks(Choreographer.java:562)	at android.view.Choreographer.doFrame(Choreographer.java:532)	at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)	at android.os.Handler.handleCallback(Handler.java:725)	at android.os.Handler.dispatchMessage(Handler.java:92)	at android.os.Looper.loop(Looper.java:137)	at android.app.ActivityThread.main(ActivityThread.java:5041)	at java.lang.reflect.Method.invokeNative(Native Method)	at java.lang.reflect.Method.invoke(Method.java:511)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)	at dalvik.system.NativeStart.main(Native Method)