java.lang.IllegalArgumentException: Don't know how to handle parent of type [javax.swing.JPanel].

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java.lang.IllegalArgumentException: Don't know how to handle parent of type [javax.swing.JPanel].
at org.springframework.richclient.util.OverlayHelper.getLayeredPane(OverlayHelper.java:343)
at org.springframework.richclient.util.OverlayHelper$OverlayUpdater.run(OverlayHelper.java:394)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
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)

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