using WCF service in mvc with csla

Hello all, 

              i have a WCF service Provided by csla. i want to consume this service in my MVC Project.  i have create a object fo service like below:

                   ClientServiceReference.WcfPortalClient obj = new ClientServiceReference.WcfPortalClient();

    to fetch the data i have used obj.fetch(). but getting error as:

 The best overloaded method match for 'Customer.ClientServiceReference.WcfPortalClient.Fetch(Csla.Server.Hosts.WcfChannel.FetchRequest)' has some invalid arguments