Attempt to index a boolean value in spell.

[whiteblXK]

Hello, I have problem with my spell, when I use it server show that error:

Lua Script Error: [Spell Interface]
in callback: data/spells/scripts/Inferno.lua:onTargetCreature
(Unknown scriptfile)
attempt to index a boolean value

This is my onTargetCreature function:

function onTargetCreature(cid, target)
            doPushCreature(target, cid)
        return true
 end

and doPushCreature(target, cid)

local function doPushCreature(target, cid)
    if target > 0 then
        local position = getThingPosition(cid)
        local fromPosition = getThingPosition(target)
        local x = ((fromPosition.x - position.x) < 0 and -1 or ((fromPosition.x - position.x) == 0 and 0 or 1))
        local y = ((fromPosition.y - position.y) < 0 and -1 or ((fromPosition.y - position.y) == 0 and 0 or 1))
        local toPosition = {x = fromPosition.x + x, y = fromPosition.y + y, z = fromPosition.z}
        if doTileQueryAdd(target, toPosition) == 1 and getTileHouseInfo(toPosition) == 0 then
            doTeleportThing(target, toPosition)
        end
    end
    return true
end

I add this functions to my source:
doTileQueryAdd
getThingPosition


I use Devland 0.97b.