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/timthumbRtCcWG

Query String : w=300&h=100&zc=2&q=100&a=c&src=http://www.campinggardameer.com/img/logo.gif
TimThumb version : 2.8.13