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/timthumbPHRdFI

Query String : src=https://www.florencevillage.com/uploads/image/1541671563687.jpg&w=600&h=600&zc=1&a=c
TimThumb version : 2.8.13