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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.(FlueVentSizing.java:150)	at biz.HVACMenu.populateTabbedPane(HVACMenu.java:52)	at biz.HVACMenu.(HVACMenu.java:41)	at biz.HVACMenu.main(HVACMenu.java:100)