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