Gravamux Error Message

[brittle crag]

Trying to spawn Gravamux in Necromancer's Courtyard but I'm getting this red error when ringing the bell.
"Error: You ring it, but nothing happens"

I cleared the yard to make sure he wasn't already spawned. I've been killing him several times daily the last few days and first time seeing this error

[rapid crow]

he most likly got killed recently and is respawn timer

[formal raptor]

Yep that does seem to be the case, try again after 15 minutes and it should work 🤞