java.lang.IllegalArgumentException

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    • java.lang.IllegalArgumentException: cannot add to layout: 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 Step1.panelStep2of5(GtraceStep1.java:233) at Step1.init(GtraceStep1.java:88) at Step1.main(GtraceStep1.java:314)

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