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/timthumbbuuNRr

Query String : w=800&h=400&zc=1&src=https://www.florencevillage.com/uploads/image/1545821532132.jpg
TimThumb version : 2.8.13