Problem consuming Restful webservice. "Found conflicts between different versions of the same dep.."


I am trying to get data from a Restful web service. I have followed the TodoREST sample. However when I build I get the warning: "Found conflicts between different versions of the same dependent assembly (MSB3247)." Could some one explain this warning?

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Text;
using System.Threading.Tasks;
using Newtonsoft.Json;  

namespace Lantern
    public class CharityDataRetriever

        HttpClient client;

        public async Task<string> FindData (string iD)
            string data = "";

            var uri = new Uri (iD);

            try {

                var response = await client.GetAsync(uri);

                if (response.IsSuccessStatusCode) {
                    var content = await response.Content.ReadAsStringAsync();
                    data = JsonConvert.DeserializeObject <string> (content);

            } catch (Exception ex) {
                Debug.WriteLine(@"     ERROR {0}", ex.Message);

            return data;


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