When you get this, it means your instance doesn't know what that relative link is supposed to lead to.
You'll need the exact name in the !name@instan.ce format, or the url to that thing for the instance its on (on kbin you always have to use the full kbin url)
Then, paste that into search on your instance, and this will make it "update the archives". It can take a sec, it might say "no results" for like minute. But after its been done, the link should work!
QuestioningEspecialy