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java.lang.ClassFormatError: apps.PanelPro.PanelPro (unrecognized class file version) at java.lang.VMClassLoader.defineClass(libgcj.so.14) at java.lang.ClassLoader.defineClass(libgcj.so.14) at java.security.SecureClassLoader.defineClass(libgcj.so.14) at java.net.URLClassLoader.findClass(libgcj.so.14) at gnu.gcj.runtime.SystemClassLoader.findClass(libgcj.so.14) at java.lang.ClassLoader.loadClass(libgcj.so.14) at java.lang.ClassLoader.loadClass(libgcj.so.14) at gnu.java.lang.MainThread.run(libgcj.so.14)