Проблема со запуском сервиса?

using SGN.Modules.Patients.Models;
 
namespace SGN.Modules.WebServices
{
    using System.ServiceModel;
    using System.Collections.Generic;
 
 
    [ServiceContract]
    [ServiceKnownType(typeof(Patient))]
    public interface IService
    {
        [OperationContract]
        List<Patient> GetPatients();
    }
}

using System.Linq;
using System.Runtime.Serialization;
 
namespace SGN.Modules.WebServices
{
    using System.Collections.Generic;
    using System.ServiceModel.Activation;
    using Patients.Models;
    using Patients.Repository;
 
    [AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]
    public class Services : IService
    {       
        public List<Patient> GetPatients()
        {
            var patientRepository = new PatientRepository();
            List<Patient> patients = patientRepository.AllIncluding(p => p.User).ToList();
            return patients;
        }
    }
}

public string GetText()
{
    return "It is work";
}