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This exception has no message.
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java.lang.NullPointerException at javax.swing.plaf.basic.BasicTreeUI.completeEditing( at javax.swing.plaf.basic.BasicTreeUI$TreeSelectionHandler.valueChanged( at javax.swing.tree.DefaultTreeSelectionModel.fireValueChanged( at javax.swing.tree.DefaultTreeSelectionModel.notifyPathChange( at javax.swing.tree.DefaultTreeSelectionModel.setSelectionPaths( at javax.swing.tree.DefaultTreeSelectionModel.setSelectionPath( at javax.swing.JTree.setSelectionPath( at javax.swing.plaf.basic.BasicTreeUI.selectPathForEvent(