升级后 kentico CMS 中的 Web 服务错误

我使用 Kentico CMS 8.0 创建了一个 Web 服务，我已将实例升级到 8.2。当我尝试从我的 Web 服务调用方法时，屏幕截图中出现错误。

这是我的方法：

[WebMethod(EnableSession = true)]
[ScriptMethod(UseHttpGet = false, ResponseFormat = ResponseFormat.Json)]
public string ProcessOrderGeneralDonation(Dictionary<string, object> request)
{
    Dictionary<string, object> response;
    ProcessDonationOrder(request, out response);
    return JSONResponse(true, "Data Populated", response);
}
private void ProcessDonationOrder(Dictionary<string, object> request, out Dictionary<string, object> response, bool isChampionOfCare = false)
{
    var dictionary = new Dictionary<string, object> { };
    #region Customer
    var customer = GetNewCustomerInfo(request);
    var customerType = ValidationHelper.GetInteger(request["customer_type"], 0);
    if (customerType == 2) //company
    {
        customer.CustomerCompany = ValidationHelper.GetString(request["customer_organization"], String.Empty);
    }
    CustomerInfoProvider.SetCustomerInfo(customer);
    var country = CountryInfoProvider.GetCountryInfo(ValidationHelper.GetString(request["customer_country"], String.Empty).Replace(" ", ""));
    //var state = StateInfoProvider.GetStateInfo(ValidationHelper.GetString(request["customer_province"], String.Empty));
    // Create new address object
    var customerAddress = GetNewCustomerAddressInfo(request, customer);
    if (country != null)
        customerAddress.AddressCountryID = country.CountryID;
    // Create the address
    AddressInfoProvider.SetAddressInfo(customerAddress);
    customerAddress.SetValue("AddressPhone", ValidationHelper.GetString(request["customer_phone"], String.Empty));
    customerAddress.SetValue("AddressStateOthers", ValidationHelper.GetString(request["customer_province"], String.Empty));
    customerAddress.Update();
    // Create order addresses from customer address
    OrderAddressInfo orderBillingAddress = OrderAddressInfoProvider.CreateOrderAddressInfo(customerAddress);
    OrderAddressInfo orderShippingAddress = OrderAddressInfoProvider.CreateOrderAddressInfo(customerAddress);
    // Set the order addresses
    OrderAddressInfoProvider.SetAddressInfo(orderBillingAddress);
    OrderAddressInfoProvider.SetAddressInfo(orderShippingAddress);
    #endregion
    var guid = ValidationHelper.GetGuid(request["guid"], Guid.Empty);
    string message;
    #region Shopping Cart
    //Get Product
    var product = GetProductSKUInfo(guid, out message);
    if (product == null)
    {
        response = null;
        return;
    }
    //Get Shopping Cart
    var cart = GetShoppingCart();
    // Add item to cart object
    var param = new ShoppingCartItemParameters(product.SKUID, 1)
    {
        ProductOptions = new List<ShoppingCartItemParameters>
        {
            new ShoppingCartItemParameters(ValidationHelper.GetInteger(request["designation_id"], 0), 1),
            new ShoppingCartItemParameters(ValidationHelper.GetInteger(request["donation_amount_id"], 0), 1)
        }
    };
    if (isChampionOfCare)
    {
        //Get Champions Of Care Option Id 
        var options = OptionCategoryInfoProvider.GetProductOptionCategories(product.SKUID, true, OptionCategoryTypeEnum.Text);
        var opt = options.Tables[0].AsEnumerable().SingleOrDefault(x => x["CategoryName"].ToString().ToLower() == "coc");
        if (opt != null)
        {
            var categoryId = ValidationHelper.GetInteger(opt["CategoryID"], 0);
            var skuOpt = GetSKUOptions(product.SKUID, categoryId) as DataTable;
            if (skuOpt != null)
            {
                var cocId = ValidationHelper.GetInteger(skuOpt.Rows[0]["SKUID"], 0);
                var cocParam = new ShoppingCartItemParameters(cocId, 1)
                {
                    Text = ValidationHelper.GetString(request["coc_text"], string.Empty)
                };
                param.ProductOptions.Add(cocParam);
            }
        }
    }
    ShoppingCartItemInfo cartItem = cart.SetShoppingCartItem(param);
    cartItem.CartItemCustomData["other_amount"] = ValidationHelper.GetDouble(request["donation_other_amount"], 0);
    cart.ShoppingCartCustomData["donation_type"] = "GEN";
    // Save item to database
    ShoppingCartItemInfoProvider.SetShoppingCartItemInfo(cartItem);
    cart.ShoppingCartBillingAddress = orderBillingAddress;
    cart.ShoppingCartShippingAddress = orderShippingAddress;
    cart.Customer = customer;
    cart.Update();
    ShoppingCartInfoProvider.SetOrder(cart);
    dictionary.Add("order_id", cart.OrderId);
    UpdateDonor(request, cart.OrderId);
    if (EnablePurchase)
    {
        Receipt responseReceipt;
        request.Add("product_sku", product.SKUID);
        Purchase(request, cart, customer, customerAddress, out responseReceipt);
        var paymentSuccessed = !responseReceipt.GetMessage().Contains("DECLINED");
        if (paymentSuccessed)
        {
            //HandleOrderNotification(cart);
            SendInvoiceEmail(cart.OrderId);
        }
        dictionary.Add("moneris_message", responseReceipt.GetMessage());
    }
    #endregion
    response = dictionary;
}

private string JSONResponse(bool success, string message, object data = null)
{
    var dictionary = new Dictionary<string, object> { { "success", success }, { "message", message }, { "data", data } };
    return JsonConvert.SerializeObject(dictionary, new JsonSerializerSettings { NullValueHandling = NullValueHandling.Ignore });
}