Get Target position

[Aleada]

Heya everyone, I was just wondering... how do you get a target's position (Monsters & Players) in "[9.80-9.86] The Forgotten Server v0.2.15 (Mystic Spirit)"?

I've tried litterally everything but all I get is this error:

[25/07/2013 21:51:56] Lua Script Error: [Spell Interface] 
[25/07/2013 21:51:56] in a timer event called from: 
[25/07/2013 21:51:56] data/spells/scripts/custom/stun.lua:onCastSpell
[25/07/2013 21:51:56] attempt to index a nil value
[25/07/2013 21:51:56] stack traceback:
[25/07/2013 21:51:57] 	[C]: at 0x07f7b03ad3e0
[25/07/2013 21:51:57] 	[C]: in function 'doSendMagicEffect'
[25/07/2013 21:51:57] 	data/spells/scripts/custom/stun.lua:13: in function <data/spells/scripts/custom/stun.lua:12>

These are some things I've tried....

function effect(cid, var, targetpos, mypos, target)
    doSendMagicEffect(mypos, CONST_ME_ENERGYHIT)
    doSendMagicEffect(targetpos, CONST_ME_ENERGYHIT)
end

	doSendMagicEffect(getCreaturePosition(target), CONST_ME_SLEEP)

local function effect(cid)
	local targ = getCreatureTarget(cid)
	doSendMagicEffect(getThingPos(targ), CONST_ME_SLEEP)
end

local function Effect(cid, target)
	local effect = getCreaturePosition(target)
	doSendMagicEffect(effect, CONST_ME_SLEEP)
end

None of them are working though :/