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java.lang.NullPointerException: 	at javax.swing.plaf.basic.BasicTreeUI.startEditing(BasicTreeUI.java:1959)	at javax.swing.plaf.basic.BasicTreeUI.startEditingAtPath(BasicTreeUI.java:506)	at javax.swing.JTree.startEditingAtPath(JTree.java:1921)	at ru.sirena2000.jxt.iface.action.TreeActionHandler.createNode(TreeActionHandler.java:62)