Same Java, but java.lang.ClassFormatError: app.CardNumberHashCalculator -

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i have 1.6.0_45 jdk , remote server has too. checked, class has major 50 version. why error occurs?

java.lang.classformaterror: app.cardnumberhashcalculator     (unrecognized class file version)    @ java.lang.vmclassloader.defineclass(libgcj.so.7rh)    @ java.lang.classloader.defineclass(libgcj.so.7rh)    @ java.security.secureclassloader.defineclass(libgcj.so.7rh)    @ java.net.urlclassloader.findclass(libgcj.so.7rh)    @ java.lang.classloader.loadclass(libgcj.so.7rh)    @ java.lang.classloader.loadclass(libgcj.so.7rh)    @ gnu.java.lang.mainthread.run(libgcj.so.7rh)


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