InvalidOperationException: Unable to resolve service for type 'Models.ResortDataJoinObj' while attempting to activate 'Controllers.ShoppingCartController'.

app.UseMvc(routes =>
            {
                routes.MapRoute(
                    name: "default",
                    template: "{controller=resortDeals}/{action=Index}/{id?}");
                routes.MapRoute(
                  name: "shoppingcart",
                  template: "{controller=ShoppingCart}/{action=Index}/{id?}");
            });

public class ShoppingCartController : Controller
{
     [Route("shoppingcart")]
    public ViewResult Index()
    {
        ...
    }
    [Route("ShoppingCart/AddToShopingCart/")]
    public RedirectToActionResult AddToShopingCart(int dealId)
    {
         var selectedDeal = (from rd in _db.ResortData
                                join ra in _db.ResortAvailability on rd.RecNo equals ra.RecNoDate
                                where Convert.ToInt32(rd.RecNo) == id
                                select new ResortDealResultsObject
                                {
                                    Name = rd.Name,
                                    ImageUrl = rd.ImageUrl,
                                    ResortDetails = rd.ResortDetails,
                                    RecNo = rd.RecNo,
                                    CheckIn = ra.CheckIn,
                                    Address = rd.Address,
                                    TotalPrice = ra.TotalPrice

                                }
                                );
            ResortDataJoinObj dealJoinObj = new ResortDataJoinObj();
            List<ResortDealResultsObject> selectedDealList = new List<ResortDealResultsObject>();
            foreach (var row in selectedDeal)
            {
                //An example of only selecting certain results
                // if (row.Name == "John" && row.TotalPrice > 15)
                // {
                var tempVm = new ResortDealResultsObject
                {
                    Name = row.Name,
                    ImageUrl = row.ImageUrl,
                    ResortDetails = row.ResortDetails,
                    RecNo = row.RecNo,
                    CheckIn = row.CheckIn,
                    Address = row.Address,
                    TotalPrice = row.TotalPrice
                };
                selectedDealList.Add(tempVm);
                //}
            }
            dealJoinObj.ResDealList = selectedDealList;
            if (selectedDeal != null)
            {
                _shoppingCart.AddToCart(dealJoinObj);
            }
            return RedirectToAction("Index");
    }
}

public class resortDealsController : Controller
    {

  public IActionResult Index()
        {
        }
 public async Task<IActionResult> Details(string id)
        {
        }
   }

@model Models.ResortDealDetailObject
@{
    ViewData["Title"] = "Details";
}

<h2>Details</h2>

<div>
    @Model.Name

    @Model.Address

    @Model.ResortDetails
</div>

@Html.Partial("AddToShoppingCart", @Model)

<div class="addToCart text-right">
        <p class="button ">
            @*<a class="btn btn-success" id="cartButton" asp-controller="ShoppingCart" asp-action="AddToShoppingCart" asp-route-id="@Model.RecNo">
                Add to cart
            </a>*@
            <button class="btn btn-success" onclick="search(@Model.RecNo)">
                Add to cart
            </button>
        </p>
    </div>
</form>

<script>
    function addToCart(recNo) {
        document.getElementById('cartForm').action = "/ShoppingCart/AddToShoppingCart/" + recNo;
        document.getElementById('cartForm').submit();
    }
</script>

public class ResortDataJoinObj
    {
        public ResortData ResData { get; set; }
        public ResortAvailability ResAvail { get; set; }
        public string priceLowEnd { get; set; }
        public string priceHighEnd { get; set; }
        public List<ResortDealResultsObject> ResDealList { get; set; }
        public ResortDealDetailObject detailObject { get; set; }
        public ResortDealResultsObject resortDeal { get; set; }
    }