No serializer found Error

[Vidula Pant]

I have published a service that is passed a byte array and that returns a
byte array as its return type. I am using ByteArrayHolder to do this,
why would I get this error?

        java.io.IOException: No serializer found for class
        javax.xml.rpc.holders.ByteArrayHolder in registry
                org.apache.axis.encoding.SerializationContextImpl@551d7f
Thanks,
Vidula