jqgrid no recarga uso mvc4 c#

Question

Hello, I'm updating a table online, related one to many, this is my structure.

My interface, aki edito a row online, in this case, I click on "edit" and a fileupload appears, where I choose my file. Then press "burn", and if I update in the bd, but the grid does not update me and an error. It seems to me that when it is a single table if it works normal, but when the table is related it does not work and this error comes out:

 

 

This is my code for how you sent the data by ajax:

var UserModel =
             {
                 "id": id,
                 "nombre_archivo": nombre_archivo
             };
         $.ajax({
             url: base_url(url_editar_grid),
             data: JSON.stringify(UserModel),
             type: 'POST',
             contentType: 'application/json; charset=utf-8',
             success: function (data) {
                 $('#listGrid').trigger('reloadGrid');
              //   alert(data);
             }
         });

As receipt on controller:

public JsonResult editar(periodo model)
        {
            var periodolista = new periodo();
            periodolista = periodolista.actualizarbatch(model.id, model.nombre_archivo);
             return Json(periodolista);
        }

In the model:

public periodo actualizarbatch(int varid, string varnombre)
      {
          var periodolista = new periodo();
          try
          {
              using (var ctx = new ProyectoContext())
              {
                      periodolista = ctx.periodo.Where(x => x.id == varid).SingleOrDefault();

                      if (!(periodolista == null))
                      {
                          periodolista.nombre_archivo = varnombre;
                      }
                  ctx.SaveChanges();

              }

          }
          catch (Exception)
          {

              throw;
          }
          return periodolista;
      }

And as a weapon my jqgrid in the controller:

ProyectoContext db = new ProyectoContext();
        [AcceptVerbs("Get", "Post")]
        public JsonResult GetTodoLists(JqGrid jqgrid, string sidx, string sord, int page, int rows)  //Gets the todo Lists.
        {
            using (var ctx = new ProyectoContext())
            {
                ctx.Configuration.LazyLoadingEnabled = false;

                int pageIndex = Convert.ToInt32(page) - 1;
                int pageSize = rows;
                  var todoListsResults = db.periodo.Select(a => new{a.id, a.añoId, a.trimestre,a.nombre_archivo,a.descripcion_archivo,a.fecha_creacion});

                int totalRecords = todoListsResults.Count();
                var totalPages = (int)Math.Ceiling((float)totalRecords / (float)rows);

                /*---*/

                if (sord.ToUpper() == "ASC")
                {
                    todoListsResults = todoListsResults.OrderByDescending(s => s.id);
                    todoListsResults = todoListsResults.Skip(pageIndex * pageSize).Take(pageSize);
                }
                else
                {
                    todoListsResults = todoListsResults.OrderBy(s => s.id);
                    todoListsResults = todoListsResults.Skip(pageIndex * pageSize).Take(pageSize);
                }
                /*---*/

                var jsonData = new
                {
                    total = totalPages,
                    page,
                    records = totalRecords,
                    rows = todoListsResults
                };
                return Json(jsonData, JsonRequestBehavior.AllowGet);
            }
        }

Please answer some, I'm stuck on this, thanks.