Rails - Sep 2006 - Delegated Webservice Problem

I set up a webservice controller like this:
----------------------------------------------------------------------
class ServiceController < ApplicationController
  wsdl_service_name ''Service''
  wsdl_namespace ''urn:inuservicexml''

  web_service_dispatching_mode :delegated
  web_service_scaffold :invoke

  web_service :userinfo, UserService.new
end
----------------------------------------------------------------------

In the UserService class and UserApi class, I defined a login method,
so I tried to access the login service by this url,
"localhost:3000/service/userinfo/login". But this generated me a very
weird warning page --

----------------------------------------------------------------------
Internal protocol error: undefined local variable or method `source''
for REXML::SourceFactory:Class Backtrace:
c:/ruby/lib/ruby/1.8/rexml/source.rb:20:in `create_from''
c:/ruby/lib/ruby/1.8/rexml/parsers/baseparser.rb:123:in `stream=''
c:/ruby/lib/ruby/1.8/rexml/parsers/baseparser.rb:100:in `initialize''
c:/ruby/lib/ruby/1.8/rexml/parsers/streamparser.rb:6:in `initialize''
c:/ruby/lib/ruby/1.8/rexml/document.rb:185:in `parse_stream''
c:/ruby/lib/ruby/1.8/xmlrpc/parser.rb:717:in `parse''
c:/ruby/lib/ruby/1.8/xmlrpc/parser.rb:475:in `parseMethodCall''
c:/ruby/lib/ruby/1.8/xmlrpc/marshal.rb:63:in `load_call''
c:/ruby/lib/ruby/1.8/xmlrpc/marshal.rb:32:in `load_call''
...
...
...
----------------------------------------------------------------------

And when I run funcational tests associating with this webservice, it
told me "ActionWebService::Container::Delegated::ContainerError: no
such web service ''login''".
I really have no idea what''s going on. I have been stucking on this
problem for days... Please help me on this... 
Thank you very much~


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