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/timthumbRe3brc

Query String : w=1170&h=470&zc=1&a=c&src=https://www.florencevillage.com/img/placeholder/internazionale.jpg
TimThumb version : 2.8.13