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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)