Really simple WCF Service using JQuery keep getting error 415 unsupported media type

I wrote a very simple WCF service with one operation contract that returns a list of points. I then wanted to use JQuery to consume the service and get the list of points on to a web page.  I was following Rick Strahl's blog: http://www.west-wind.com/weblog/posts/324917.aspx.

I keep geeting the error: 415 unsupported media type

Please could you let me know where I'm going wrong. Thanks!

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.Text;
using System.ServiceModel.Web;
 
namespace Contracts
{
    [ServiceContract(Name = "TestService", Namespace = "Contracts")]
    public interface ITestService
    {
        [OperationContract]
        [WebInvoke(
            Method = "POST", 
            BodyStyle = WebMessageBodyStyle.Wrapped, 
            ResponseFormat = WebMessageFormat.Json)]
        List<Point> Search();
    }
}
 
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.Serialization;
 
namespace Contracts
{
    [DataContract]
    public class Point
    {
        [DataMember]
        public double X { get; set; }
        [DataMember]
        public double Y { get; set; }
    }
}
 
    <script type="text/javascript" src="http://code.jquery.com/jquery-latest.js"></script>
    <script type="text/javascript" src="http://www.json.org/json2.js"></script>
 
        function Run() {
            var url = "http://localhost:1436/services/testservice.svc/Search";
            var json = JSON.stringify("");
            
            $.ajax({
                url: url,
                data: json,
                type: "POST",
                processData: false,
                contentType: "application/json",
                timeout: 10000,
                dataType: "text",
                success: function(result) { alert("Success"); },
                error: function(result) { alert("Error"); }
            });           
        }

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