java.lang.ClassFormatError: de/moonflower/jfritz/utils/ReverseLookupGermany (Bad magic number)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:539)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:251)
at java.net.URLClassLoader.access$100(URLClassLoader.java:55)
at java.net.URLClassLoader$1.run(URLClassLoader.java:194)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:187)
at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274)
at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
at de.moonflower.jfritz.utils.ReverseLookup.lookup(ReverseLookup.java:39)
at de.moonflower.jfritz.JFritzWindow$4.construct(JFritzWindow.java:667)
at de.moonflower.jfritz.utils.SwingWorker$2.run(SwingWorker.java:112)
at java.lang.Thread.run(Thread.java:552)