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/timthumb85s0TZ

Query String : w=150&h=180&zc=1&a=t&src=http://www.federcampeggio.it/images/banner-rally.jpg?319
TimThumb version : 2.8.13