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/timthumbc6JGua

Query String : w=800&h=400&zc=1&a=c&src=https://www.florencevillage.com/uploads/image/1571734011816.jpg
TimThumb version : 2.8.13