We cannot complete this request, remote data could not be fetched

Hi,

Have a look:
http://creersonsite.net/exemple-de-blog-professionnel/
(comments section)

The image url is:
http://i1.wp.com/creersonsite.net/wp-content/plugins/avatars/avatars-files/images/default-avatar-192.png
I don't understand what it is...
And I get this error message:
"We cannot complete this request, remote data could not be fetched"

Any idea?

Thanks!