I have seen this error message on occasion but never often enough to stop and report it. The latest occurrence is when trying to view this topic:
clicking on a link from this one (second post):
I see same, and I’ve got moderator privileges, I suspect it’s just a dead link.
I know a lot of "how to” type topics, where migrated over to the Roon Knowledge Base.
You folks are so helpful, you even used to teach us how to type!