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/timthumbt43IMC

Query String : a=c&h=100&q=100&src=http%3A%2F%2Fwww.campinggardameer.com%2Fimg%2Flogo.gif&w=300&zc=2
TimThumb version : 2.8.13