java.lang.NullPointerException: This exception has no message.

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This exception has no message.
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 com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2329)
at android.view.View.dispatchPointerEvent(View.java:7893)
at android.view.ViewRootImpl$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)

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