Spells not working.. :(

[tinkthank]

I have cast ritual of rebirth twice now in a MP game -- but to no avail. I cast it twice because I thought perhaps I forgot to cast it the first time, since nothing happened, but now I have wasted the gems 2x in a row. I get no result from Ritual of Rebirth. (And yes, the commander was a non-undead human in the Hall of fame, and no he was not kicked out of the hall of fame during the interim. He's still there, still dead.)