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/timthumbzLXf1Y

Query String : h=150&src=http%3A%2F%2Fwww.torinofilmfest.org%2Fpublic%2Fuploaded%2F5ef3c9d5562f7a347a3b5a1af689b727111654.gif&zc=2
TimThumb version : 2.8.13