Atom link 'not a feed'?

Posted by tedthetrumpet on
URL: https://support.nabble.com/Atom-link-not-a-feed-tp7600728.html

I use https://theoldreader.com/ to subscribe to the http://new-supercollider-mailing-lists-forums-use-these.2681727.n2.nabble.com/ via nabble. This has worked for years, but I just
noticed I've not had any new posts in that feed since May 24. Now, when I go
here to try to resubscribe to the feed:

http://new-supercollider-mailing-lists-forums-use-these.2681727.n2.nabble.com/template/NamlServlet.jtp?macro=feeds&node=2676391

… and use the link under 'topics and replies', the old reader says the feed
'cannot be validated', sending me here:

http://validator.w3.org/feed/check.cgi?url=http://new-supercollider-mailing-lists-forums-use-these.2681727.n2.nabble.com/SuperCollider-Users-New-Use-this-f2676391.xml

… which says this is 'not a feed'.

Any ideas?