Lua Help defining my target on a spell...

[DemShion]

Hello everyone, i need help defining my target on a spell, it goes like this:

local pos = getPosByDir(getCreaturePosition(cid), getCreatureLookDirection(cid), 1)
local target = getTopCreature(pos)
local lvl, ml = getPlayerLevel(cid), getPlayerMagLevel(cid)
local h1, h2 = ((((lvl * 3) / 2) + (ml * 4)) + 10), ((((lvl * 3) / 2) + (ml * 4)) + 20)
local hAmount = math.random(h1,h2)

bla bla bla bla bla

 --and then i need to do this--

doCreatureAddHealth(target, hAmount)

so yeah i do that and the server send me an error saying it couldnt find the creature >.<

[Error - Spell Interface]
mods/scripts/customspells/dark purification.lua:onCastSpell
Description:
(luaDoCreatuReAddHealth) Creature not found

I've also tried whit doTargetCombatHealth() same result...

[Error - Spell Interface]
mods/scripts/customspells/dark purification.lua:onCastSpell
Description:
(luaDoTargetCombatHealth) Creature not found

Help me please u.u and ty for reading.