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java.lang.NullPointerException: 	at java.awt.Container.setComponentZOrder(Container.java:760)	at packages.CustomActionListener.(Menu.java:101)	at packages.MyFirstPanel.(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)