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This exception has no message.
java.lang.NullPointerException: 	at javax.swing.plaf.basic.BasicTreeUI.getDropLineRect(Unknown Source)	at javax.swing.plaf.basic.BasicTreeUI.access$1600(Unknown Source)	at javax.swing.plaf.basic.BasicTreeUI$Handler.repaintDropLocation(Unknown Source)	at javax.swing.plaf.basic.BasicTreeUI$Handler.propertyChange(Unknown Source)	at java.beans.PropertyChangeSupport.firePropertyChange(Unknown Source)	at java.beans.PropertyChangeSupport.firePropertyChange(Unknown Source)	at java.awt.Component.firePropertyChange(Unknown Source)	at javax.swing.JTree.setDropLocation(Unknown Source)	at javax.swing.TransferHandler$DropHandler.setComponentDropLocation(Unknown Source)	at javax.swing.TransferHandler$DropHandler.cleanup(Unknown Source)	at javax.swing.TransferHandler$DropHandler.drop(Unknown Source)	at java.awt.dnd.DropTarget.drop(Unknown Source)	at javax.swing.TransferHandler$SwingDropTarget.drop(Unknown Source)	at sun.awt.dnd.SunDropTargetContextPeer.processDropMessage(Unknown Source)	at sun.awt.dnd.SunDropTargetContextPeer$EventDispatcher.dispatchDropEvent(Unknown Source)	at sun.awt.dnd.SunDropTargetContextPeer$EventDispatcher.dispatchEvent(Unknown Source)	at sun.awt.dnd.SunDropTargetEvent.dispatch(Unknown Source)	at java.awt.Component.dispatchEventImpl(Unknown Source)	at java.awt.Container.dispatchEventImpl(Unknown Source)	at java.awt.Component.dispatchEvent(Unknown Source)	at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)	at java.awt.LightweightDispatcher.processDropTargetEvent(Unknown Source)	at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)	at java.awt.Container.dispatchEventImpl(Unknown Source)	at java.awt.Window.dispatchEventImpl(Unknown Source)	at java.awt.Component.dispatchEvent(Unknown Source)