Delivengo carrier is not available in checkout

Delivengo carrier is not available in checkout

The Delivengo carrier may not be available in checkout for the products that don't have any weight configured.

The code of the module checks the weight of the product, when added to the cart:
 if ($product['weight'] <= 0) {
                    $not_available = true;
                }

Therefore, it is necessary to go to your Back office> Catalog> Products, choose the product that caused error and change its weight in Shipping window.
Afterward, reload the checkout page and choose the Delivengo carrier.