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java.lang.NullPointerException at java.awt.Container.addImpl(Container.java:625) at java.awt.Container.add(Container.java:307) at biz.FlueVentSizing.buildSectionPanel(FlueVentSizing.java:216) at biz.FlueVentSizing.<init>(FlueVentSizing.java:150) at biz.HVACMenu.populateTabbedPane(HVACMenu.java:52) at biz.HVACMenu.<init>(HVACMenu.java:41) at biz.HVACMenu.main(HVACMenu.java:100)