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This exception has no message.
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java.lang.NullPointerException: 	at java.awt.Container.addImpl(Container.java:1097)	at java.awt.Container.add(Container.java:417)	at BallShooter$MainPanel.(BallShooter.java:52)	at BallShooter.(BallShooter.java:24)	at BallShooter.main(BallShooter.java:42)