got error in creating models from MVC application

@model Surveys.SurveysServiceReference.Survey

@{
    ViewBag.Title = "Create";
}

using System;
using System.Runtime.Serialization;
using System.Collections.Generic;

namespace SurveysService.Models
{
    [DataContract(IsReference = true)]
    public class Survey
    {
        public Survey()
        {
            this.Topics = new List<Topic>();
        }
        [DataMember]
        public int SurveyID { get; set; }
        [DataMember]
        public string Title { get; set; }
        [DataMember]
        public string CreatedBy { get; set; }
        [DataMember]
        public Nullable<System.DateTime> Date { get; set; }
        [DataMember]
        public virtual ICollection<Topic> Topics { get; set; }
    }
}