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java.lang.NullPointerException: 	at com.izforge.izpack.installer.GUIInstaller.loadGUI(GUIInstaller.java:646)	at com.izforge.izpack.installer.GUIInstaller.access$100(GUIInstaller.java:82)	at com.izforge.izpack.installer.GUIInstaller$2.run(GUIInstaller.java:213)	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:240)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:543)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:268)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:197)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:191)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:183)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:144)