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cannot add to lay out: constraint must be a string
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)