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java.lang.ClassFormatError: SwingingApplet (Bad magic number) at java.lang.ClassLoader.defineClass0(Native Method) at java.lang.ClassLoader.defineClass( at at sun.applet.AppletClassLoader.findClass( at at java.lang.ClassLoader.loadClass( at sun.applet.AppletClassLoader.loadClass( at java.lang.ClassLoader.loadClass( at sun.applet.AppletClassLoader.loadCode( at sun.applet.AppletPanel.createApplet( at sun.plugin.AppletViewer.createApplet( at sun.applet.AppletPanel.runLoader( at at