404 error indicates that a necessary page is not found. This error usually happens in all online stores. For example, if a product is deleted because it is not available for sale any more, url will show 404 error. Customers don't like to see this error. A good solution here is to show an alternative content (Sitemap) instead of 404 error that can help to navigate the site.
Compatible with CS-Cart 2.2.x, 3.0.x, 4.x.x.