@Codinablack, is TFS 1.0 and I fixed changing:
function onDeath(cid, corpse, killer, mostDamage, unjustified, mostDamage_unjustified)
local monster = Monster(cid)
to
function onDeath(cid, corpse, killer, mostDamage, unjustified, mostDamage_unjustified)
local monster = Creature(cid)
SOLVED :D