java.lang.IllegalArgumentException

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    • java.lang.IllegalArgumentException: cannot add to lay out: constraint must be a string at java.awt.CardLayout.addLayoutComponent(Unknown Source) at java.awt.Container.addImpl(Unknown Source) at java.awt.Container.add(Unknown Source) at GtraceStep1.panelStep2of5(GtraceStep1.java:236) at GtraceStep1.init(GtraceStep1.java:90) at GtraceStep1.main(GtraceStep1.java:318)

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