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java.lang.NullPointerException at java.awt.Container.setComponentZOrder(Container.java:760) at packages.CustomActionListener.<init>(Menu.java:101) at packages.MyFirstPanel.<init>(Menu.java:75) at packages.Menu.createFirstPanel(Menu.java:44) at packages.Menu.createPanels(Menu.java:38) at packages.Menu.runGUI(Menu.java:21) at packages.Menu.main(Menu.java:64)