It's probably because of adblock or something like that but there is so many ways to frame it correctly like "cannot load image".

uBlock Origin doesn't trigger that. Latest Firefox, too.

The cause of the error is not the problem, it's the way to report the error that is problematic. But if you really want to know, it was umatrix that was blocking third party "media.graphcms.com"

Perhaps the message should be "please use an adblocker with a better blocklist"

uMatrix does, it loads (presumably) the SVG data from media.graphcms.com