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java.lang.ClassCastException: 	at javax.swing.LayoutComparator.compare(Unknown Source)	at javax.swing.LayoutComparator.compare(Unknown Source)	at java.util.TimSort.countRunAndMakeAscending(Unknown Source)	at java.util.TimSort.sort(Unknown Source)	at java.util.TimSort.sort(Unknown Source)	at java.util.Arrays.sort(Unknown Source)	at java.util.Collections.sort(Unknown Source)	at javax.swing.SortingFocusTraversalPolicy.enumerateAndSortCycle(Unknown Source)	at javax.swing.SortingFocusTraversalPolicy.getFocusTraversalCycle(Unknown Source)	at javax.swing.SortingFocusTraversalPolicy.getFirstComponent(Unknown Source)	at javax.swing.LayoutFocusTraversalPolicy.getFirstComponent(Unknown Source)	at javax.swing.SortingFocusTraversalPolicy.getDefaultComponent(Unknown Source)	at java.awt.FocusTraversalPolicy.getInitialComponent(Unknown Source)	at java.awt.DefaultKeyboardFocusManager.dispatchEvent(Unknown Source)	at java.awt.Component.dispatchEventImpl(Unknown Source)	at java.awt.Container.dispatchEventImpl(Unknown Source)	at java.awt.Window.dispatchEventImpl(Unknown Source)	at java.awt.Component.dispatchEvent(Unknown Source)	at java.awt.EventQueue.dispatchEventImpl(Unknown Source)	at java.awt.EventQueue.access$200(Unknown Source)	at java.awt.EventQueue$3.run(Unknown Source)	at java.awt.EventQueue$3.run(Unknown Source)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)	at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)	at java.awt.EventQueue$4.run(Unknown Source)	at java.awt.EventQueue$4.run(Unknown Source)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)	at java.awt.EventQueue.dispatchEvent(Unknown Source)	at java.awt.SequencedEvent.dispatch(Unknown Source)	at java.awt.EventQueue.dispatchEventImpl(Unknown Source)	at java.awt.EventQueue.access$200(Unknown Source)	at java.awt.EventQueue$3.run(Unknown Source)	at java.awt.EventQueue$3.run(Unknown Source)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)	at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)	at java.awt.EventQueue$4.run(Unknown Source)	at java.awt.EventQueue$4.run(Unknown Source)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)	at java.awt.EventQueue.dispatchEvent(Unknown Source)	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)	at java.awt.EventDispatchThread.run(Unknown Source)