java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at java.awt.Container.addImpl(Container.java:439)
at java.awt.Container.add(Container.java:298)
at undefined.TestEg2.(TestEg2.java:18)
at undefined.TestEg2.main(TestEg2.java:38)

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