Не могу получить GetSpellTargetUnit() Lua 132

function InitSpellTrigger()

	local SpellTrigger = CreateTrigger()

	for i = 0, bj_MAX_PLAYER_SLOTS - 1 do
		local player = Player(i)

		TriggerRegisterPlayerUnitEvent(SpellTrigger, player, EVENT_PLAYER_UNIT_SPELL_ENDCAST)

	end
	TriggerAddAction(SpellTrigger, function()

		local caster           = GetTriggerUnit()
		local target=GetSpellTargetUnit()-------не могу определить
		local casterX, casterY = GetUnitX(caster), GetUnitY(caster)
		local spellId          = GetSpellAbilityId()
		local ownplayer=GetOwningPlayer(caster)
		local new


		print(GetUnitName(target).."цель каста невозможно узнать")
		.
		.
		.
		.