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java.lang.ArrayIndexOutOfBoundsException: 3 >= 3	at java.util.Vector.removeElementAt(Vector.java:521)	at javax.swing.tree.VariableHeightLayoutCache$TreeStateNode.collapse(VariableHeightLayoutCache.java:1583)	at javax.swing.tree.VariableHeightLayoutCache$TreeStateNode.collapse(VariableHeightLayoutCache.java:1277)	at javax.swing.tree.VariableHeightLayoutCache.setExpandedState(VariableHeightLayoutCache.java:170)	at javax.swing.plaf.basic.BasicTreeUI$TreeExpansionHandler.treeCollapsed(BasicTreeUI.java:2327)	at javax.swing.JTree.fireTreeCollapsed(JTree.java:2273)	at javax.swing.JTree.setExpandedState(JTree.java:2989)	at javax.swing.JTree.collapsePath(JTree.java:1773)	at javax.swing.plaf.basic.BasicTreeUI.toggleExpandState(BasicTreeUI.java:2106)	at javax.swing.plaf.basic.BasicTreeUI.selectPathForEvent(BasicTreeUI.java:2194)	at javax.swing.plaf.basic.BasicTreeUI$MouseHandler.handleSelection(BasicTreeUI.java:2840)	at javax.swing.plaf.basic.BasicTreeUI$MouseHandler.mousePressed(BasicTreeUI.java:2801)	at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:218)	at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:217)	at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:217)	at java.awt.Component.processMouseEvent(Component.java:5131)	at java.awt.Component.processEvent(Component.java:4931)	at java.awt.Container.processEvent(Container.java:1566)	at java.awt.Component.dispatchEventImpl(Component.java:3639)	at java.awt.Container.dispatchEventImpl(Container.java:1623)	at java.awt.Component.dispatchEvent(Component.java:3480)	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3450)	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3162)	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3095)	at java.awt.Container.dispatchEventImpl(Container.java:1609)	at java.awt.Window.dispatchEventImpl(Window.java:1590)	at java.awt.Component.dispatchEvent(Component.java:3480)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:450)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:197)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:144)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:136)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:99)