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java.lang.NullPointerException: 	at javax.swing.plaf.basic.BasicTreeUI.completeEditing(	at javax.swing.plaf.basic.BasicTreeUI.completeEditing(	at javax.swing.plaf.basic.BasicTreeUI.startEditing(	at javax.swing.plaf.basic.BasicTreeUI$MouseHandler.mousePressed(	at java.awt.Component.processMouseEvent(	at java.awt.Component.processEvent(	at java.awt.Container.processEvent(	at java.awt.Component.dispatchEventImpl(	at java.awt.Container.dispatchEventImpl(