nopSolutions/nopCommerce · error · NopException

{warning1};{warning2};...

Error message

{warning1};{warning2};...

What it means

Thrown when IShoppingCartService.GetShoppingCartWarningsAsync returns one or more warnings for the cart as a whole (not per-item). The warnings are aggregated into a single semicolon-delimited string and thrown as a NopException. These are cart-level integrity checks such as attribute conflicts, tier/quantity issues, or product availability problems.

Source

Thrown at src/Libraries/Nop.Services/Orders/OrderProcessingService.cs:504

    /// <param name="currentCurrency">The working currency</param>
    /// <returns>A task that represents the asynchronous operation</returns>
    /// <exception cref="NopException">Validation problems</exception>
    protected virtual async Task PrepareAndValidateShoppingCartAndCheckoutAttributesAsync(PlaceOrderContainer details, ProcessPaymentRequest processPaymentRequest, Currency currentCurrency)
    {
        //checkout attributes
        details.CheckoutAttributesXml = await _genericAttributeService.GetAttributeAsync<string>(details.Customer, NopCustomerDefaults.CheckoutAttributes, processPaymentRequest.StoreId);
        details.CheckoutAttributeDescription = await _checkoutAttributeFormatter.FormatAttributesAsync(details.CheckoutAttributesXml, details.Customer);

        //load shopping cart
        details.Cart = await _shoppingCartService.GetShoppingCartAsync(details.Customer, ShoppingCartType.ShoppingCart, processPaymentRequest.StoreId);

        if (!details.Cart.Any())
            throw new NopException("Cart is empty");

        //validate the entire shopping cart
        var warnings = await _shoppingCartService.GetShoppingCartWarningsAsync(details.Cart, details.CheckoutAttributesXml, true);
        if (warnings.Any())
            throw new NopException(warnings.Aggregate(string.Empty, (current, next) => $"{current}{next};"));

        //validate individual cart items
        foreach (var sci in details.Cart)
        {
            var product = await _productService.GetProductByIdAsync(sci.ProductId);

            var sciWarnings = await _shoppingCartService.GetShoppingCartItemWarningsAsync(details.Customer,
                sci.ShoppingCartType, product, processPaymentRequest.StoreId, sci.AttributesXml,
                sci.CustomerEnteredPrice, sci.RentalStartDateUtc, sci.RentalEndDateUtc, sci.Quantity, false, sci.Id);
            if (sciWarnings.Any())
                throw new NopException(sciWarnings.Aggregate(string.Empty, (current, next) => $"{current}{next};"));
        }

        //min totals validation
        if (!await ValidateMinOrderSubtotalAmountAsync(details.Cart))
        {
            var minOrderSubtotalAmount = await _currencyService.ConvertFromPrimaryStoreCurrencyAsync(_orderSettings.MinOrderSubtotalAmount, currentCurrency);
            throw new NopException(string.Format(await _localizationService.GetResourceAsync("Checkout.MinOrderSubtotalAmount"),

View on GitHub (pinned to 64bdf2ff08)

Solutions

1. Display the cart warnings to the customer on the shopping cart page before checkout and let them resolve them.
2. Verify all cart items reference active, published products with sufficient stock.
3. Ensure required checkout attributes are filled in the checkout flow.
4. Check the exact warning strings returned by GetShoppingCartWarningsAsync to pinpoint the root cause.

Example fix

// before: proceeding to PlaceOrder with cart warnings unresolved
// after:
var warnings = await _shoppingCartService.GetShoppingCartWarningsAsync(cart, checkoutAttributesXml, true);
if (warnings.Any())
    // show warnings to customer, block checkout
    return;

// Before PlaceOrder, resolve all cart-level warnings
var warnings = await _shoppingCartService.GetShoppingCartWarningsAsync(
    cart, checkoutAttributesXml, true);
if (warnings.Any())
{
    foreach (var w in warnings)
        _notificationService.ErrorNotification(w);
    return RedirectToRoute("ShoppingCart");
}

bool CartHasNoWarnings(IList<string> warnings) =>
    warnings == null || warnings.Count == 0;

try
{
    var result = await _orderProcessingService.PlaceOrderAsync(processPaymentRequest);
}
catch (NopException ex) when (ex.Message.Contains(";"))
{
    // likely aggregated cart warnings; split and display
    foreach (var part in ex.Message.Split(';', StringSplitOptions.RemoveEmptyEntries))
        _notificationService.ErrorNotification(part.Trim());
    return RedirectToRoute("ShoppingCart");
}

When it happens

Trigger: A product in the cart was deactivated or deleted after being added. Required checkout attributes are missing or conflicting. A product's inventory dropped below the cart quantity between add-to-cart and checkout. Gift card or rental attributes are misconfigured. The cart has items requiring approval that wasn't granted.

Common situations: Customer left items in the cart overnight and the product went out of stock or was unpublished. Admin deactivated a product variant while customers had it in cart. Required checkout attributes weren't selected (e.g. gift wrap, delivery date). Quantity exceeds newly-set maximum order limits.

Related errors

• Shipping address is not provided
• Cart is empty
• Billing address is not provided
• recurringCyclesError
• Order total couldn't be calculated

AI-assisted analysis of nopSolutions/nopCommerce@64bdf2ff08 (2026-08-13). Data as JSON: /api/errors/abb4243514a14202. Report an issue: GitHub.