WCF - Contract Name could not be found in the list of contracts

I am relatively new to WCF. However, I need to create a service that exposes data to both Silverlight and AJAX client applications. In an attempt to accomplish this, I have created the following service to serve as a proof of concept:

[ServiceContract(Namespace="urn:MyCompany.MyProject.Services")]
public interface IJsonService
{
    [OperationContract]
    [WebInvoke(Method = "GET",
               RequestFormat=WebMessageFormat.Json,
               ResponseFormat = WebMessageFormat.Json)]
    List<String> JsonFindNames();
}

[ServiceContract(Namespace="urn:MyCompany.MyProject.Services")]
public interface IWsService
{
    [OperationContract(Name="FindNames")]
    List<String> WsFindNames();
}


[ServiceBehavior(Name="myService", Namespace="urn:MyCompany.MyProject.Services")]
public class myService : IJsonService, IWsService
{
    public List<String> JsonFindNames() 
        { return FindNames(); }
    public List<String> WsFindNames()
        { return FindNames(name); }
    public List<string> FindNames()
    { 
       List<string> names = List<string>(); 
       names.Add("Alan");
       names.Add("Bill");
       return results; 
    }        
}

When I try to access this service, I receive the following error:

The contract name 'myService' could not be found in the list of contracts implemented by the service 'myService'.

What is the cause of this? How do I fix this?

Thank you

Your contract is the Interface not the implementation.

Somewhere in the config you have written myService instead of IJsonService.

Remove the namespace from Service name. It will work fine.