[trevius]

Character:HealOnLevel is the correct rule for it. Perhaps you are running an older version of the emu code before that rule was added. What version are you running? Also, maybe the "true" setting is case sensitive. I can't recall for sure since I am not at my server atm, but I think the settings might need to be started with caps like "True". Although I don't think that would cause it to not find the rule itself. I think that would spit out another error.