java.lang.IllegalArgumentException: adding a container to a container on a different GraphicsDevice

Exception in thread "AWT-EventQueue-2" java.lang.IllegalArgumentException: adding a container to a container on a different GraphicsDevice
at java.awt.Component.checkGD(Unknown Source)
at java.awt.Container.checkGD(Unknown Source)
at java.awt.Container.checkGD(Unknown Source)
at java.awt.Container.checkGD(Unknown Source)
at java.awt.Container.checkGD(Unknown Source)
at java.awt.Container.checkGD(Unknown Source)
at java.awt.Container.checkGD(Unknown Source)
at java.awt.Container.checkGD(Unknown Source)
at java.awt.Container.addImpl(Unknown Source)
at javax.swing.JLayeredPane.addImpl(Unknown Source)
at java.awt.Container.add(Unknown Source)
at javax.swing.JRootPane.setContentPane(Unknown Source)
at javax.swing.JApplet.setContentPane(Unknown Source)
at com.eteks.sweethome3d.applet.AppletApplication$1.collectionChanged(Unknown Source)
at com.eteks.sweethome3d.model.CollectionChangeSupport.fireCollectionChanged(Unknown Source)
at com.eteks.sweethome3d.model.HomeApplication.addHome(Unknown Source)
at com.eteks.sweethome3d.applet.AppletApplication$2.run(Unknown Source)
at java.awt.event.InvocationEvent.dispatch(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)


Thanks!

Charles