java.lang.NullPointerException

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  • java.lang.NullPointerException at Exercise4.Exercise4a.Door.paint(Door.java:23) at Exercise4.Exercise4a.Exercise4a.init(Exercise4a.java:11) at sun.applet.AppletPanel.run(AppletPanel.java:341) at java.lang.Thread.run(Thread.java:536)
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