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java.lang.NullPointerException: 	at javax.swing.plaf.basic.BasicTreeUI.completeEditing(Unknown Source)	at javax.swing.plaf.basic.BasicTreeUI.completeEditing(Unknown Source)	at javax.swing.plaf.basic.BasicTreeUI$Handler.valueChanged(Unknown Source)	at javax.swing.tree.DefaultTreeSelectionModel.fireValueChanged(Unknown Source)	at javax.swing.tree.DefaultTreeSelectionModel.notifyPathChange(Unknown Source)	at javax.swing.tree.DefaultTreeSelectionModel.removeSelectionPaths(Unknown Source)	at javax.swing.JTree.removeDescendantSelectedPaths(Unknown Source)	at javax.swing.JTree.removeDescendantSelectedPaths(Unknown Source)	at javax.swing.JTree$TreeModelHandler.treeNodesRemoved(Unknown Source)	at javax.swing.tree.DefaultTreeModel.fireTreeNodesRemoved(Unknown Source)	at javax.swing.tree.DefaultTreeModel.nodesWereRemoved(Unknown Source)	at javax.swing.tree.DefaultTreeModel.removeNodeFromParent(Unknown Source)	at TreeBasic.promote(TreeBasic.java:62)