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java.lang.NullPointerException: 	at javax.swing.plaf.basic.BasicListUI$ListDropTargetListener.updateInsertionLocation(BasicListUI.java:2241)	at javax.swing.plaf.basic.BasicDropTargetListener.dragOver(BasicDropTargetListener.java:230)	at javax.swing.TransferHandler$SwingDropTarget.dragOver(TransferHandler.java:567)	at sun.awt.dnd.SunDropTargetContextPeer.processMotionMessage(SunDropTargetContextPeer.java:484)	at sun.awt.dnd.SunDropTargetContextPeer.access$600(SunDropTargetContextPeer.java:52)	at sun.awt.dnd.SunDropTargetContextPeer$EventDispatcher.dispatchMotionEvent(SunDropTargetContextPeer.java:781)	at sun.awt.dnd.SunDropTargetContextPeer$EventDispatcher.dispatchEvent(SunDropTargetContextPeer.java:738)	at sun.awt.dnd.SunDropTargetEvent.dispatch(SunDropTargetEvent.java:29)	at java.awt.Component.dispatchEventImpl(Component.java:3456)	at java.awt.Container.dispatchEventImpl(Container.java:1623)	at java.awt.Component.dispatchEvent(Component.java:3439)	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3450)	at java.awt.LightweightDispatcher.processDropTargetEvent(Container.java:3236)	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3090)	at java.awt.Container.dispatchEventImpl(Container.java:1609)	at java.awt.Window.dispatchEventImpl(Window.java:1585)	at java.awt.Component.dispatchEvent(Component.java:3439)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:450)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:197)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:144)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:136)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:99)