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

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This exception has no message.
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This exception has no message.
java.lang.NullPointerException:
at java.awt.Container.addImpl(Container.java:1093)
at java.awt.Container.add(Container.java:1005)
at javax.swing.JFrame.addImpl(JFrame.java:567)
at java.awt.Container.add(Container.java:417)
at cc.cc.(cc.java:28)
at cc.cc.main(cc.java:34)

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