Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException
	at javax.swing.LayoutComparator.compare(LayoutComparator.java:61)
	at java.util.Arrays.mergeSort(Arrays.java:1270)
	at java.util.Arrays.mergeSort(Arrays.java:1282)
	at java.util.Arrays.sort(Arrays.java:1210)
	at java.util.Collections.sort(Collections.java:157)
	at javax.swing.SortingFocusTraversalPolicy.enumerateAndSortCycle(SortingFocusTraversalPolicy.java:119)
	at javax.swing.SortingFocusTraversalPolicy.getFirstComponent(SortingFocusTraversalPolicy.java:434)
	at javax.swing.LayoutFocusTraversalPolicy.getFirstComponent(LayoutFocusTraversalPolicy.java:148)
	at javax.swing.SortingFocusTraversalPolicy.getDefaultComponent(SortingFocusTraversalPolicy.java:511)
	at java.awt.FocusTraversalPolicy.getInitialComponent(FocusTraversalPolicy.java:152)
	at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:350)
	at java.awt.Component.dispatchEventImpl(Component.java:4532)
	at java.awt.Container.dispatchEventImpl(Container.java:2097)
	at java.awt.Window.dispatchEventImpl(Window.java:2489)
	at java.awt.Component.dispatchEvent(Component.java:4488)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:668)
	at java.awt.EventQueue.access$400(EventQueue.java:81)
	at java.awt.EventQueue$2.run(EventQueue.java:627)
	at java.awt.EventQueue$2.run(EventQueue.java:625)
	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$3.run(EventQueue.java:641)
	at java.awt.EventQueue$3.run(EventQueue.java:639)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:638)
	at java.awt.SequencedEvent.dispatch(SequencedEvent.java:101)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:666)
	at java.awt.EventQueue.access$400(EventQueue.java:81)
	at java.awt.EventQueue$2.run(EventQueue.java:627)
	at java.awt.EventQueue$2.run(EventQueue.java:625)
	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$3.run(EventQueue.java:641)
	at java.awt.EventQueue$3.run(EventQueue.java:639)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:638)
	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)