java.lang.ClassFormatError: BuildPieChart2D (Bad magic number)

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java.lang.ClassFormatError: BuildPieChart2D (Bad magic number)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(
at sun.applet.AppletClassLoader.findClass(
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(

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