[Twisted-Python] Adding introspection to xlmrpc server

I'm trying the example found at: http://twistedmatrix.com/documents/current/web/howto/xmlrpc.html#auto3 And it doesn't seem to be working.  The following test code fails: import xmlrpclibs = xmlrpclib.ServerProxy("http://localhost:8080")print s.listMethods() The error says that the listMethods method isn't defined.  If I create an xmrpc server without twisted and add introspection, it works fine.  Is there a problem with the example or am I doing something wrong? Thanks,Justin