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The 404 error occurs when:

you put a link to a page that doesn't exist, because you have upper / lower case (index or index) is not observed, or a wrong extension (htm or html) specified, or you have simply a mistake.

you used a hyperlink from another website to a non-existing page on our website

you used an "old" search engine link.

a page of our website is registered as a bookmark, but the page does not exist anymore.