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adding a window to a container
java.lang.IllegalArgumentException: adding a window to a container	at java.awt.Container.addImpl(	at java.awt.Container.add(	at madkit.platform.desktop.DesktopBooter.makeExternalWindow(	at madkit.platform.desktop.DesktopAgent.addAgent(	at madkit.platform.desktop.DesktopBooter.setupGUI(	at madkit.kernel.Kernel.launchAgent(	at madkit.kernel.AbstractAgent.launchAgent(	at madkit.platform.desktop.DesktopAgent.launchAgent(	at madkit.platform.desktop.JavaAgentNode.execute(	at treetools.GenericTree.mousePressed(	at java.awt.AWTEventMulticaster.mousePressed(	at java.awt.Component.processMouseEvent(	at java.awt.Component.processEvent(	at java.awt.Container.processEvent(	at java.awt.Component.dispatchEventImpl(	at java.awt.Container.dispatchEventImpl(	at java.awt.Component.dispatchEvent(	at java.awt.LightweightDispatcher.retargetMouseEvent(	at java.awt.LightweightDispatcher.processMouseEvent(	at java.awt.LightweightDispatcher.dispatchEvent(	at java.awt.Container.dispatchEventImpl(	at java.awt.Window.dispatchEventImpl(	at java.awt.Component.dispatchEvent(	at java.awt.EventQueue.dispatchEvent(	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(	at java.awt.EventDispatchThread.pumpEventsForHierarchy(	at java.awt.EventDispatchThread.pumpEvents(	at java.awt.EventDispatchThread.pumpEvents(	at