The web server returned an HTTP 4xx error. See: [[http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.4.6|HTTP 4xx error codes]]

This error appears for HTTP 4xx errors in the range 400,405-. For HTTP 401-404 there are specific errors with dedicated error pages.

HTTP 416 Requested Range Not Satisfiable - This is usually happening when the file is too small.