java.lang.NullPointerException: This exception has no message.

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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)

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