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java.lang.NullPointerException at sun.awt.datatransfer.DataTransferer.getFormatsForFlavors(DataTransferer.java:702) at sun.awt.datatransfer.DataTransferer.getFormatsForTransferable(DataTransferer.java:670) at sun.awt.dnd.SunDragSourceContextPeer.startDrag(SunDragSourceContextPeer.java:101) at java.awt.dnd.DragSource.startDrag(DragSource.java:305) at java.awt.dnd.DragSource.startDrag(DragSource.java:402) at java.awt.dnd.DragGestureEvent.startDrag(DragGestureEvent.java:221)