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java.util.ConcurrentModificationException: 	at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:448)	at java.util.AbstractList$Itr.next(AbstractList.java:419)	at com.hdsc.plus.app.vista.app.orderentry.OrderSelectionTree$5.mousePressed(OrderSelectionTree.java:335)	at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:222)	at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:221)	at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:221)	at java.awt.Component.processMouseEvent(Component.java:5097)	at java.awt.Component.processEvent(Component.java:4897)	at java.awt.Container.processEvent(Container.java:1569)	at java.awt.Component.dispatchEventImpl(Component.java:3615)	at java.awt.Container.dispatchEventImpl(Container.java:1627)	at java.awt.Component.dispatchEvent(Component.java:3477)	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3483)	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3195)	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3128)	at java.awt.Container.dispatchEventImpl(Container.java:1613)	at java.awt.Window.dispatchEventImpl(Window.java:1606)	at java.awt.Component.dispatchEvent(Component.java:3477)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:456)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:145)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:100)