java.lang.IllegalArgumentException: adding a window to a container at at

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java.lang.IllegalArgumentException: adding a window to a container at at
at java.awt.Container.addImpl(Container.java:616)
at java.awt.Container.add(Container.java:518)
at undefined.TheDealer.setupTable(TheDealer.java:130)
at undefined.TheDealer.(TheDealer.java:33)
at undefined.Portland.main(Portland.java:5)

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