Lua Spells do not dmg

[Akirama]

Hi,
Can someome tell me why this spell do not dmg ?

local combat = Combat()
combat:setParameter(COMBAT_PARAM_TYPE, COMBAT_ENERGYDAMAGE)
combat:setArea(createCombatArea(AREA_SQUAREWAVE5))

function onGetFormulaValues(cid, level, magicLevel)
    local min = (level / 5) + (magicLevel * 1.4) + 8
    local max = (level / 5) + (magicLevel * 1.4) + 8
    return -min, -max
end

combat:setCallback(CALLBACK_PARAM_LEVELMAGICVALUE, "onGetFormulaValues")

function onCastSpell(cid, var)
    local player = Player(cid)
    local playerPos = player:getPosition()
    local playerDir = player:getDirection()

    if playerDir == NORTH then
        Position(playerPos.x + 2, playerPos.y - 1, playerPos.z):sendMagicEffect(100)
    elseif playerDir == SOUTH then
        Position(playerPos.x + 2, playerPos.y + 4, playerPos.z):sendMagicEffect(101)
    elseif playerDir == WEST then
        Position(playerPos.x - 2, playerPos.y + 1, playerPos.z):sendMagicEffect(99)
    elseif playerDir == EAST then
        Position(playerPos.x + 4, playerPos.y + 1, playerPos.z):sendMagicEffect(98)
    end

    return combat:execute(cid, var)
end

TFS 1.3 , 8.6

 

[Marko999x]

function onCastSpell(cid, var)
    local player = Player(cid)
    local playerPos = player:getPosition()
    local playerDir = player:getDirection()

    if playerDir == NORTH then
        Position(playerPos.x + 2, playerPos.y - 1, playerPos.z):sendMagicEffect(44)
    elseif playerDir == SOUTH then
        Position(playerPos.x + 2, playerPos.y + 4, playerPos.z):sendMagicEffect(44)
    elseif playerDir == WEST then
        Position(playerPos.x - 2, playerPos.y + 1, playerPos.z):sendMagicEffect(44)
    elseif playerDir == EAST then
        Position(playerPos.x + 4, playerPos.y + 1, playerPos.z):sendMagicEffect(44)
    end

    return combat:execute(cid, var)
end

thats why you not dealing any damage.
you send send a effect there but how do you regirst the damage in that case?