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java.lang.ArrayIndexOutOfBoundsException: 2 >= 2	at java.util.Vector.elementAt(Vector.java:417)	at javax.swing.tree.DefaultMutableTreeNode.getChildAt(DefaultMutableTreeNode.java:231)	at javax.swing.tree.DefaultTreeModel.getChild(DefaultTreeModel.java:151)	at NodeHandler.treeCollapsed(NodeHandler.java:62)	at javax.swing.JTree.fireTreeCollapsed(JTree.java:2156)	at javax.swing.JTree.setExpandedState(JTree.java:2770)	at javax.swing.JTree.collapsePath(JTree.java:1671)	at javax.swing.plaf.basic.BasicTreeUI.toggleExpandState(BasicTreeUI.java:2033)	at javax.swing.plaf.basic.BasicTreeUI.handleExpandControlClick(BasicTreeUI.java:2009)	at javax.swing.plaf.basic.BasicTreeUI.checkForClickInExpandControl(BasicTreeUI.java:1963)	at javax.swing.plaf.basic.BasicTreeUI$MouseHandler.mousePressed(BasicTreeUI.java:2674)	at java.awt.Component.processMouseEvent(Component.java:3714)	at java.awt.Component.processEvent(Component.java:3546)	at java.awt.Container.processEvent(Container.java:1164)	at java.awt.Component.dispatchEventImpl(Component.java:2595)	at java.awt.Container.dispatchEventImpl(Container.java:1213)	at java.awt.Component.dispatchEvent(Component.java:2499)	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:2451)	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:2210)