What Does the Computer Error "Not Found: The Requested URL Was Not Found on This Server" Mean on AOL.com Sites?

On sites hosted by AOL.com, error messages stating that a page was not found are the result of minor mistakes made by web developers. "Page not found" errors are fairly common online. When a hyperlink directs a user to a page that does not exist, an error message appears instead.

Sometimes, web sites are revised to include new or updated information. When a web developer updates a web site, he must ensure that all hyperlinks included throughout the site are still valid. One possible scenario occurs when multiple pages, each with some information, are consolidated into one, more comprehensive, page. References to the old pages need to be updated across the entire site, as the old files do not exist anymore and lead to error messages.