'Failed to get a proxied URL for the image' intermittent error on validation



All the cards on this feed, https://twitter.com/stylistmagazine, are not having their images displayed. The validator tool is intermittently giving me the ‘Failed to get a proxied URL for the image’ error. An example URL is http://www.stylist.co.uk/red-carpet/red-carpet-round-up/latest-celebrity-fashion-and-red-carpet-style-photos-august-26-2013.

Is this a problem Twitter’s side?


I am now receiving this error: ‘Invalid image. This image cannot be fetched.’.

Can anyone advise?