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java.lang.NullPointerException: 	at android.support.v7.widget.RecyclerView.computeHorizontalScrollOffset(RecyclerView.java:1548)	at android.view.View.canScrollHorizontally(View.java:11879)	at android.support.v4.view.ViewCompatICS.canScrollHorizontally(ViewCompatICS.java:31)	at android.support.v4.view.ViewCompat$ICSViewCompatImpl.canScrollHorizontally(ViewCompat.java:1249)	at android.support.v4.view.ViewCompat.canScrollHorizontally(ViewCompat.java:1684)	at android.support.v4.view.ViewPager.canScroll(ViewPager.java:2561)	at android.support.v4.view.ViewPager.canScroll(ViewPager.java:2552)	at android.support.v4.view.ViewPager.canScroll(ViewPager.java:2552)	at android.support.v4.view.ViewPager.onInterceptTouchEvent(ViewPager.java:1923)	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1859)	at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)	at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)	at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)	at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)	at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)	at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)	at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)	at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)	at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2096)	at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1542)	at android.app.Activity.dispatchTouchEvent(Activity.java:2476)	at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:60)	at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:60)	at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2044)	at android.view.View.dispatchPointerEvent(View.java:7897)	at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:3965)	at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:3844)	at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3410)	at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3460)	at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3429)	at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3536)	at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3437)	at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3593)	at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3410)	at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3460)	at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3429)	at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3437)	at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3410)	at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:5623)	at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:5603)	at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:5574)	at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:5703)	at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185)	at android.view.InputEventReceiver.nativeConsumeBatchedInputEvents(InputEventReceiver.java)	at android.view.InputEventReceiver.consumeBatchedInputEvents(InputEventReceiver.java:176)	at android.view.ViewRootImpl.doConsumeBatchedInput(ViewRootImpl.java:5676)	at android.view.ViewRootImpl$ConsumeBatchedInputRunnable.run(ViewRootImpl.java:5722)	at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)	at android.view.Choreographer.doCallbacks(Choreographer.java:574)	at android.view.Choreographer.doFrame(Choreographer.java:542)	at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)	at android.os.Handler.handleCallback(Handler.java:733)	at android.os.Handler.dispatchMessage(Handler.java:95)	at android.os.Looper.loop(Looper.java:136)	at android.app.ActivityThread.main(ActivityThread.java:5285)	at java.lang.reflect.Method.invokeNative(Method.java)	at java.lang.reflect.Method.invoke(Method.java:515)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:935)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:751)	at dalvik.system.NativeStart.main(NativeStart.java)