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/timthumbYAk8js

Query String : src=http://www.florencevillage.com/uploads/image/1494529637776.jpg&w=600&h=600&zc=1&a=c
TimThumb version : 2.8.13