Question Detail

I am using WelcomeCoordinatorLayout as Form WIzard but on swipe to next getting error Android?

I am getting this error.

FATAL EXCEPTION: main
             Process: com.example, PID: 8271
             java.lang.NullPointerException: Attempt to invoke virtual method 'void android.view.VelocityTracker.addMovement(android.view.MotionEvent)' on a null object reference

             at com.redbooth.WelcomeCoordinatorTouchController.onTouchEvent(WelcomeCoordinatorTouchController.java:98)
             at com.redbooth.WelcomeCoordinatorLayout.onTouchEvent(WelcomeCoordinatorLayout.java:244)

             at android.view.View.dispatchTouchEvent(View.java:10023)

             at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2626)

             at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2307)

             at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2632)

             at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2321)

             at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2632)

             at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2321)

             at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2632)

             at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2321)

             at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2632)

             at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2321)

             at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2632)

             at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2321)

             at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2632)

             at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2321)

             at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2632)

             at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2321)

             at com.android.internal.policy.DecorView.superDispatchTouchEvent(DecorView.java:413)

             at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1808)

             at android.app.Activity.dispatchTouchEvent(Activity.java:3061)

             at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:71)

             at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:71)

             at com.android.internal.policy.DecorView.dispatchTouchEvent(DecorView.java:375)

             at android.view.View.dispatchPointerEvent(View.java:10243)

             at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4438)

             at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4306)

             at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3853)

             at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3906)

             at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3872)

             at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3999)

             at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3880)

             at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:4056)

             at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3853)

             at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3906)

             at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3872)

             at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3880)

             at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3853)

             at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:6246)

             at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:6220)

             at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:6181)

             at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:6349)

             at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185)

             at android.view.InputEventReceiver.nativeConsumeBatchedInputEvents(Native Method)

             at android.view.InputEventReceiver.consumeBatchedInputEvents(InputEventReceiver.java:176)

             at android.view.ViewRootImpl.doConsumeBatchedInput(ViewRootImpl.java:6320)

             at android.view.ViewRootImpl$ConsumeBatchedInputRunnable.run(ViewRootImpl.java:6372)

07-28 12:33:08.035 8271-8271/com.Example E/AndroidRuntime:     at android.view.Choreographer$CallbackRecord.run(Choreographer.java:874)

             at android.view.Choreographer.doCallbacks(Choreographer.java:686)

             at android.view.Choreographer.doFrame(Choreographer.java:615)

             at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:860)

             at android.os.Handler.handleCallback(Handler.java:751)

             at android.os.Handler.dispatchMessage(Handler.java:95)

             at android.os.Looper.loop(Looper.java:154)

             at android.app.ActivityThread.main(ActivityThread.java:6119)

             at java.lang.reflect.Method.invoke(Native Method)

             at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)

             at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)