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java.lang.IllegalStateException: Timer already cancelled.	at java.util.Timer.sched(Timer.java:354)	at java.util.Timer.schedule(Timer.java:170)	at oracle.ide.explorer.IconOverlayTracker$NodeWatcher.updateVisibleNodes(IconOverlayTracker.java:802)	at oracle.ide.explorer.IconOverlayTracker$NodeWatcher.access$3000(IconOverlayTracker.java:713)	at oracle.ide.explorer.IconOverlayTracker$NodeWatcher$NodeUserListener.treeExpanded(IconOverlayTracker.java:969)	at javax.swing.JTree.fireTreeExpanded(JTree.java:2666)	at javax.swing.JTree.setExpandedState(JTree.java:3427)	at javax.swing.JTree.expandPath(JTree.java:2163)	at javax.swing.plaf.basic.BasicTreeUI.toggleExpandState(BasicTreeUI.java:2204)	at javax.swing.plaf.basic.BasicTreeUI.handleExpandControlClick(BasicTreeUI.java:2191)	at javax.swing.plaf.basic.BasicTreeUI.checkForClickInExpandControl(BasicTreeUI.java:2149)	at oracle.ideimpl.plaf.WindowsTreeUI.access$600(WindowsTreeUI.java:39)	at oracle.ideimpl.plaf.WindowsTreeUI$MouseHandler.mousePressed(WindowsTreeUI.java:178)	at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:262)	at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:262)	at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:262)	at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:262)	at java.awt.Component.processMouseEvent(Component.java:6287)	at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)	at oracle.ideimpl.explorer.CustomTree.processMouseEvent(CustomTree.java:220)	at java.awt.Component.processEvent(Component.java:6055)	at java.awt.Container.processEvent(Container.java:2039)	at java.awt.Component.dispatchEventImpl(Component.java:4653)	at java.awt.Container.dispatchEventImpl(Container.java:2097)	at java.awt.Component.dispatchEvent(Component.java:4481)	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4575)	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4233)	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4166)	at java.awt.Container.dispatchEventImpl(Container.java:2083)	at java.awt.Window.dispatchEventImpl(Window.java:2489)	at java.awt.Component.dispatchEvent(Component.java:4481)	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:648)	at java.awt.EventQueue.access$000(EventQueue.java:84)	at java.awt.EventQueue$1.run(EventQueue.java:607)	at java.awt.EventQueue$1.run(EventQueue.java:605)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98)	at java.awt.EventQueue$2.run(EventQueue.java:621)	at java.awt.EventQueue$2.run(EventQueue.java:619)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:618)	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)