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/timthumbxUXJst

Query String : a=c&h=900&src=http%3A%2F%2Fwww.centrosald.com%2Fuploads%2Fimage%2F1416299220951.jpg&w=1900&zc=1
TimThumb version : 2.8.13