What is Error 404?

HTTP 404 error

It means "FILE NOT FOUND ERROR".

When trying to load a URL or File and they are not in the specified path, then a 404 message will appear indicating that the file is not found.

You need to make sure that the URL is correct (look for missing letters, spaces and such).

It could be that the webpage/file was removed/deleted or changed URL and that is why this path does not work.

It generally means that you're even though your web browser managed to connect successfully to the required web server, the requested page could not be found.