java.lang.IllegalArgumentException

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    • java.lang.IllegalArgumentException: cannot add to layout: constraint must be a s tring at java.awt.CardLayout.addLayoutComponent(CardLayout.java:190) at java.awt.Container.addImpl(Container.java:664) at java.awt.Container.add(Container.java:307) at Trajectory.init(Trajectory.java:277) at sun.applet.AppletPanel.run(AppletPanel.java:347) at java.lang.Thread.run(Thread.java:536)

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