Data Binding error

Question

Hello Team, I tried binding these tables together and this is the error mesage that came in the screenshot below

 

 public JsonResult UpdateItem(int? ItemId)
        {
            var dataList = objRestaurantDBEntities.tblItems.Include("tblCategory").Include("tblQuantity").ToList();
            var modifiedData = dataList.AsEnumerable().Where(x => x.ItemId == ItemId).Select(d => new bindItem
                {

                    ItemId = d.ItemId,
                    CategoryId = d.CategoryId,
                    PCode = d.PCode,
                    CategoryName = d.tblCategory.CategoryName,
                    QuantityId = d.QuantityId,
                    Quantity = d.tblQuantities.Quantity,
                    ItemName = d.ItemName,
                    ItemPrice = d.ItemPrice,
                    Active = d.Active
                }).FirstOrDefault();
            return Json(modifiedData, JsonRequestBehavior.AllowGet); 
        

        }