As David mentioned, first make sure you're using binary mode for FTP. That's just a checkoff item.
If so, look at the error message: java.lang.UnsupportedClassVersionError
At JDK 1.5, changes were made to the binary format and previous JVM's won't run the program. That's what it sounds like. Run java -version ( actually JAVA *VERSION on the AS/400 ) to see what version you're using. If below 1.5, you'll need to recompile with a pre 1.5 version or make sure you're running a 1.5+ version.
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