A 404 error occurs when: there are corrupted browser caches or cookies a user attempts to access a web page that doesn't exist. your server received the browser's request but rejected it for some reason trying to upload a file that is too large.

404 error occurs when a user attempts to access a web page that doesn't exist. This error message is commonly displayed when a web page or resource is no longer available on the server. It indicates that the server was able to communicate with the client, but it could not find the requested resource. This can happen for various reasons, such as a deleted or moved page, a mistyped URL, or a broken link.