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

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at sun.awt.datatransfer.DataTransferer.getFormatsForFlavors(
at sun.awt.datatransfer.DataTransferer.getFormatsForTransferable(
at sun.awt.dnd.SunDragSourceContextPeer.startDrag(
at java.awt.dnd.DragSource.startDrag(
at java.awt.dnd.DragSource.startDrag(
at java.awt.dnd.DragGestureEvent.startDrag(

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