java.lang.NullPointerException

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    • java.lang.NullPointerException at java.awt.Container.addImpl(Container.java:439) at java.awt.Container.add(Container.java:298) at lab4.init(lab4.java:34) at sun.applet.AppletPanel.run(AppletPanel.java:341) at java.lang.Thread.run(Thread.java:536)

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