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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.<init>(BallShooter.java:52) at BallShooter.<init>(BallShooter.java:24) at BallShooter.main(BallShooter.java:42)