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cannot add to layout: constraint must be a string (or null)
java.lang.IllegalArgumentException: cannot add to layout: constraint must be a string (or null)	at java.awt.BorderLayout.addLayoutComponent(BorderLayout.java:409)	at java.awt.Container.addImpl(Container.java:664)	at java.awt.Container.add(Container.java:518)	at javax.swing.text.ComponentView.setComponentParent(ComponentView.java:281)	at javax.swing.text.ComponentView$1.run(ComponentView.java:243)	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:178)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:454)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:141)	at java.awt.Dialog$1.run(Dialog.java:540)	at java.awt.Dialog.show(Dialog.java:561)