Setting followers as essential

[perylousdemon ●]

Anyone know how to do this? I've been trying with Farkas since I gained him as a follower, but the "setessential" command doesn't seem to be working, for some reason. I keep getting error messages: "invalid actor base" or "missing parameter actor base". I know the base ID I'm using is correct, as it's the one that shows up when I select him with the console open, and it's also listed on the wiki. Any help would be appreciated.

EDIT: Never mind, got it to work. A mod can lock this thread if they want.