Cannot cremate corpse (need material)
I have a crematorium that is configured to forever burn corpses. I have a pile of dead bodies nearby, but when i try to prioritize work in there, I only get:
Cannot cremate corpse (need material)
I am pretty sure that colonists could burn corpses before, but then apparently they stopped for unknown reason.
Figured that out, seems it's a bug with the error description. It says "needs material", but in practice I have built a wall and a door in such a way that it was inaccessible, so that's what fixed it for me, built the door at the correct spot :)