Problem in webservice

I have created a webservice named annonce (there is its code ) class AnnonceApi < ActionWebService::API::Base   api_method :find_all_annonces,   :returns => [[:int]]

and its controller has been declared in this way:

class BackendController < ApplicationController   require 'annonce_api'

  wsdl_service_name 'Backend'   web_service_api AnnonceApi   web_service_scaffold :invoke

  def find_all_annonces     Annonce.find(:all).map{ |annonce| annonce.id }   end end

when I try to test the invoke It work http://localhost:3009/backend/invoke but when a client try to access to this webservice , he receives 2 kinds of errors

the first ---- uninitialized constant ClientController::AnnonceApi when I use such method

opts = {}   client = ActionWebService::Client::Soap.new(AnnonceApi, 'http:// localhost:3009/backend/api',:namespace=> "AnnonceApi", :driver_options => opts)

  def list     @annonces = client.find_all_annonces   end the second error ----- Missing API definition file in apis/annonce_api.rb

when using the other method   web_client_api :annonce,:soap,"http://localhost:3009/backend/api&quot;

   def list    @annonces = client.find_all_annonces   end

I need your help as soon as possible , because I am preparing a project of my end studies , and I still have just a week to end its so please if someone can answer me in this few days

thanks