about UndefinedService

Hi again.

i have code:

def auth(username, password):
    try:
        user = authenticate(username=username, password=password)
    except:
        pass

class MyGateway(object):
    """
    Service for customers of TaleoGateway that provides some methods ...
    """
    @ladonize(unicode, unicode, rtype=unicode)
    def test_login(self, username, password):
        #Try authentication via django auth-module
        auth(username, password)
        return "Hello %(username)s. You are user as active= " % locals()

when i try this via client python-shell it work:

but when i run this via soap it return in web-browser next messages:

Traceback (most recent call last):
  File "/usr/local/lib/python2.6/dist-packages/ladon/server/wsgi_application.py", line 241, in __call__
    raise UndefinedService(ifname,'Service "%s" has not been exposed' % sname)
UndefinedService: Service "soap" has not been exposed

but in trace server show as:
localhost.localdomain - - [27/Jul/2011 16:12:25] "POST //soap HTTP/1.1" 200 272

What is problem with that. UndefinedService: Service "soap" has not been exposed
what need to added to my code for fix ?

Thanks !