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adding a window to a container
java.lang.IllegalArgumentException: adding a window t
 o a container	at java.awt.Container.checkNotAWindow(Container.java:483)	at java.awt.Container.addImpl(Container.java:1084)	at java.awt.Container.add(Container.java:966)	at IntroPanel.(IntroPanel.java:44)	at PizzaLab.main(PizzaLab.java:25)