An exception of type 'System.Net.WebException' occurred in System.dll but was not handled in user code

Additional information: The remote server returned an error: (404) Not Found.

var res = wc.UploadValues("http://ns2278995.ovh.net/proyectos/paymentsystem/trunk/backoffice/en/api/user/insert", nvc);

TimeSpan unixTicks = new TimeSpan(DateTime.UtcNow.Ticks) - epochTicks;
   string dt = unixTime.ToString();

   string X_PUBLIC = GenerateHash(AccessToken + dt);

 string status = "1",
                   name = "test1",
                   surnames = "test",
                   email = "user@test.com",
                   password = "password123",
                   language = "ENG",
                   country = "Spain",
                   region = "Catalonia",
                   city = "Barcelona",
                   postalCode = "08007",
                   streetAddress = "Balmes",
                   numberAddress = "24",
                   floorAddress = "2",
                   phone = "9355552288",
                   birthDay = "";


            string DATAs = "<?xml version='1.0' encoding='utf-8'?>" +
                              "<TransaxRS>" +
                                "' status ='" + status +
                                "' name ='" + name +
                                "' surnames ='" + surnames +
                                "' email ='" + email +
                                "' password ='" + password +
                                "' language ='" + language +
                                "' country ='" + country +
                                "' region ='" + region +
                                "' city ='" + city +
                                "' postalCode ='" + postalCode +
                                "' streetAddress ='" + streetAddress +
                                "' floorAddress ='" + floorAddress +
                                "' numberAddress ='" + numberAddress +
                                "' phone ='" + phone +
                                "' birthDay ='" + birthDay +
                                "'/>" +
                                "</TransaxRS>";
   string hmac = GenerateHMAC(AccessToken, DATAs);
   WebClient wc = new WebClient();
   wc.Headers.Add("token", X_PUBLIC);
   wc.Headers.Add("X_HASH", hmac);
  NameValueCollection nvc = new NameValueCollection();
  var res = wc.UploadValues("http://ns2278995.ovh.net/proyectos/paymentsystem/trunk/backoffice/en/api/user/insert", nvc);