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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)