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java.lang.NullPointerException: 	at com.mobeta.android.dslv.DragSortController.onScroll(DragSortController.java:381)	at android.view.GestureDetector.onTouchEvent(GestureDetector.java:579)	at com.mobeta.android.dslv.DragSortController.onTouch(DragSortController.java:243)	at com.mobeta.android.dslv.DragSortListView.onTouch(DragSortListView.java:584)	at android.view.View.dispatchTouchEvent(View.java:7708)	at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2210)	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1945)	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 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$DecorView.superDispatchTouchEvent(PhoneWindow.java:2329)	at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1568)	at android.app.Activity.dispatchTouchEvent(Activity.java:2458)	at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2277)	at android.view.View.dispatchPointerEvent(View.java:7893)	at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:3950)	at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:3829)	at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3395)	at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3445)	at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3414)	at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3521)	at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3422)	at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3578)	at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3395)	at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3445)	at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3414)	at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3422)	at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3395)	at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:5535)