A TimThumb error has occured

The following error(s) occured:

The remote file is not a valid image. Mimetype = 'text/html' File = /var/www/html/timthumb/cache/timthumbnf2SxV

Query String : w=641&h=350&zc=2&a=t&src=http://www.torinofilmfest.org/public/uploaded/OFF_FlynnJohn.jpg
TimThumb version : 2.8.13