java.lang.ClassFormatError: SwingingApplet (Bad magic number)

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HelloApplet (Bad magic number)
java.lang.ClassFormatError: SwingingApplet (Bad magic number)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:509)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
at sun.applet.AppletClassLoader.findClass(AppletClassLoader.java:146)
at sun.plugin.security.PluginClassLoader.findClass(PluginClassLoader.java:189)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.applet.AppletClassLoader.loadClass(AppletClassLoader.java:112)
at java.lang.ClassLoader.loadClass(ClassLoader.java:262)
at sun.applet.AppletClassLoader.loadCode(AppletClassLoader.java:473)
at sun.applet.AppletPanel.createApplet(AppletPanel.java:548)
at sun.plugin.AppletViewer.createApplet(AppletViewer.java:1621)
at sun.applet.AppletPanel.runLoader(AppletPanel.java:477)
at sun.applet.AppletPanel.run(AppletPanel.java:290)
at java.lang.Thread.run(Thread.java:536)

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