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java.lang.NullPointerException: at java.awt.BorderLayout.layoutContainer(BorderLayout.java:608) at java.awt.Container.layout(Container.java:494) at java.awt.Container.doLayout(Container.java:484) at java.awt.Container.validateTree(Container.java:553) at java.awt.Container.validateTree(Container.java:560) at java.awt.Container.validateTree(Container.java:560) at java.awt.Container.validate(Container.java:535) at sun.applet.AppletViewer$1$AppletEventListener.appletStateChanged(AppletViewer.java:226) at sun.applet.AppletPanel.dispatchAppletEvent(AppletPanel.java:229) at sun.applet.AppletPanel.appletResize(AppletPanel.java:616) at java.applet.Applet.resize(Applet.java:149) at java.applet.Applet.resize(Applet.java:160) at sun.applet.AppletPanel.run(AppletPanel.java:331) at java.lang.Thread.run(Thread.java:479)