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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.<init>(IntroPanel.java:44) at PizzaLab.main(PizzaLab.java:25)