I have a WCF service error with ....Found node type 'Element' with name 'tns:downloadOrders

Question

I've taken over a project made in asp.net c# using a svc file that was more or less complete. I have a third party trying to connect to this service. and they are getting the error when trying to run the DownloadOrders action

Sorry if this is something silly but i have no idea about SOAP webservices

OperationFormatter encountered an invalid Message body. Expected to find node type 'Element' with name 'DownloadOrders' and namespace 'http://schema.example.com'. Found node type 'Element' with name 'tns:downloadOrders' and namespace 'http://schema.example.com'

I have the code

namespace WebShopServiceLibrary
{
using System;
using System.Collections.Generic;
using System.ServiceModel;

[ServiceContract(Namespace = "http://schema.example.com", Name = "DownloadOrders")]
public interface IWebShopService
{
    [OperationContract]
    bool CompleteOrder(string cartId);
    [OperationContract(Action = "http://mywebsite.com/WebShopService?class=WebShopService&method=downloadOrders",
        Name = "DownloadOrders", ReplyAction = "http://schema.example.com")]

    IList<WSOrder> DownloadOrders();
    [OperationContract]
    string SayHello();
    }
}

I've tried a few things by guessing and finding whatever i could on the internet but am having no luck.

Any help would be greatly appriciated

EDITED Thanks here is the request from the third party

POST http://www.mywebsite.co.uk/WebShop/WebShopService.svc HTTP/1.1
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; MS Web Services Client Protocol     2.0.50727.5420)
VsDebuggerCausalityData:    uIDPo6vC8nDAd61IqHUONkdct2QAAAAAPjFJqj7Kp0ucNDHglgII9Lf1sYSLziBNtVp3NnVPAecACQAA
Content-Type: text/xml; charset=utf-8
SOAPAction: "http://thridpartywebsite.com/WebShopService?class=WebShopService&method=downloadOrders"
Host: www.mywebsite.co.uk
Content-Length: 480
Expect: 100-continue
Connection: Keep-Alive

<?xml version="1.0" encoding="utf-8"?><soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/" xmlns:tns="http://schema.example.com" xmlns:types="http://schema.example.com/encodedTypes" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"><soap:Body soap:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"><tns:downloadOrders /></soap:Body></soap:Envelope> 

Answer 1

There is a mismatch in the name:

DownloadOrders

and

tns:downloadOrders

Notice the difference in capitalisation. You must make sure that the server and the client match.