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java.lang.IllegalArgumentException: null source	at java.util.EventObject.(	at java.awt.AWTEvent.(	at java.awt.event.ComponentEvent.(	at java.awt.event.WindowEvent.(	at java.awt.event.WindowEvent.(	at java.awt.DefaultKeyboardFocusManager.dispatchEvent(	at java.awt.Component.dispatchEventImpl(	at java.awt.Container.dispatchEventImpl(	at java.awt.Window.dispatchEventImpl(	at java.awt.Component.dispatchEvent(	at java.awt.EventQueue.dispatchEvent(	at java.awt.SequencedEvent.dispatch(	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