Erro Gym System (DxP)

Olá galera. Estou com um erro quando o lider do ginásio libera o pokemon, o pokemon não ataca. Da um erro na distro, e quando mato o pokemon, nada mais acontece.

Erro:

[11/07/2017 14:28:35] [Error - Npc interface] 
[11/07/2017 14:28:35] In a timer event called from: 
[11/07/2017 14:28:35] data/npc/scripts/brock.lua:onCreatureSay
[11/07/2017 14:28:35] Description: 
[11/07/2017 14:28:35] data/npc/scripts/brock.lua:36: attempt to call global 'doSetMonsterGym' (a nil value)
[11/07/2017 14:28:35] stack traceback:
[11/07/2017 14:28:35]     data/npc/scripts/brock.lua:36: in function <data/npc/scripts/brock.lua:21>

Segue o código do lider do ginásio:

local focus = 0
local max_distance = 10
local talk_start = 0
local conv = 0
local fighting = false
local challenger = 0
local afk_limit_time = 300	-- seconds
local afk_time = 0		-- don't change
local battle_turn = 1		-- don't change
local challenger_turn = 0	-- don't change

local pokemons = {
{name = "Sudowoodo", optionalLevel = 400, sex = SEX_MALE, nick = "", ball = "great"},
{name = "Rhydon", optionalLevel = 300, sex = SEX_MALE, nick = "", ball = "great"},   --alterado v1.3
{name = "Steelix", optionalLevel = 400, sex = SEX_MALE, nick = "", ball = "great"},
{name = "Onix", optionalLevel = 300, sex = SEX_MALE, nick = "", ball = "great"},
{name = "Shiny Golem", optionalLevel = 300, sex = SEX_MALE, nick = "", ball = "great"},
}


local function doSummonGymPokemon(npc)
    local this = npc
    if not isCreature(this) then return true end
    if #getCreatureSummons(this) >= 1 or focus == 0 then return true end
    local it = pokemons[battle_turn]
    doSummonMonster(this, it.name)
    local summon = getCreatureSummons(this)[1]
    local balleffect = pokeballs["great"].effect
        if it.ball and pokeballs[it.ball] then
            balleffect = pokeballs[it.ball].effect
        end
    doSendMagicEffect(getThingPos(summon), balleffect)
    setPlayerStorageValue(summon, 10000, balleffect)
    setPlayerStorageValue(summon, 10001, gobackmsgs[math.random(#gobackmsgs)].back:gsub("doka", it.nick ~= "" and it.nick or it.name))
    setPlayerStorageValue(summon, 1007, it.nick ~= "" and it.nick or it.name)
    doSetMonsterGym(summon, focus)
    local name = it.nick ~= "" and it.nick or getCreatureName(this).."s "..it.name
    setWildPokemonLevel(summon, it.level, getPokemonStatus(it.name, (it.extralevel + it.level)), name, 1.5)
    doCreatureSay(this, gobackmsgs[math.random(#gobackmsgs)].go:gsub("doka", getPlayerStorageValue(summon, 1007)), 1)
    fighting = true
    battle_turn = battle_turn + 1
end

local function doWinDuel(cid, npc)
	if not isCreature(cid) then return true end
	local this = npc
	local a = gymbadges[getCreatureName(this)] + 8
	doCreatureSay(npc, "You won the duel! Congratulations, take this "..getItemNameById(a - 8).." as a prize.", 1)
	local b = getPlayerItemById(cid, true, a)
	if b.uid > 0 then doTransformItem(b.uid, b.itemid - 8) end
doPlayerSendCancel(cid, "#getBadges# "..getCreatureName(this).." "..getPlayerItemCount(cid, gymbadges[getCreatureName(this)]))
end

function onCreatureSay(cid, type, msg)

	local msg = string.lower(msg)

	if focus == cid then
		talk_start = os.clock()
	end

	if msgcontains(msg, 'hi') and focus == 0 and getDistanceToCreature(cid) <= 4 then
		focus = cid
		talk_start = os.clock()
		conv = 1
		selfSay("Hello "..getCreatureName(cid)..", my name is Brock and I'm Pewter's Gym Leader. How may I help you?")
	return true
	end

	if isDuelMsg(msg) and conv == 1 and focus == cid then

		--if getPlayerItemCount(cid, gymbadges[getCreatureName(getThis())]) >= 1 then
		--	selfSay("You have already won my Boulder Badge, maybe some other day we can fight.")
		--	focus = 0
		--return true
		--end

		--if not hasPokemon(cid) then
			--selfSay("To battle agains't a gym leader you need pokemons.")
		--return true
		--end

		--selfSay("You are challenging me to a battle. It will be a "..#pokemons.." pokemon limit battle, let's start?")
		--conv = 2

		
	        if getPlayerStorageValue(cid, 992) == 1 then
            focus = 0
            selfSay("already battled with you , find another leader of gym!")
        return true
        end
        selfSay("You are challenging me to a battle. It will be a "..#pokemons.." pokemon limit battle, let's start?")
        conv = 2
  
	
	
	return true
	end

	if isConfirmMsg(msg) and conv == 2 and focus == cid then

		challenger = focus
		setPlayerStorageValue(cid, 990, 1)
		selfSay("Yea, let's fight!")
		talk_start = os.clock()
		addEvent(doSummonGymPokemon, 850, getThis())
		conv = 3

	return true
	end

	if isNegMsg(msg) and conv == 2 and focus == cid then

		focus = 0
		selfSay("It is better for you to refuse a battle against me!")

	return true
	end

	if msgcontains(msg, 'bye') and focus == cid then
		selfSay('Bye and do your best trainer!')
		setPlayerStorageValue(focus, 990, -1)
		focus = 0
	return true
	end
end

local afk_warning = false
local change = false

function onThink()

	if focus == 0 then
		selfTurn(2)
		fighting = false
		challenger = 0
		challenger_turn = 0
		battle_turn = 1
		afk_time = 0
		afk_warning = false

		if #getCreatureSummons(getThis()) >= 1 then
			setPlayerStorageValue(getCreatureSummons(getThis())[1], 1006, 0)
			doCreatureAddHealth(getCreatureSummons(getThis())[1], -getCreatureMaxHealth(getCreatureSummons(getThis())[1]))
		end

	return true
	else

	if not isCreature(focus) then
		focus = 0
	return true
	end

	if fighting then

		talk_start = os.clock()

		if not isCreature(getCreatureTarget(getThis())) then
			if #getCreatureSummons(challenger) >= 1 then
				if getCreatureOutfit(getCreatureSummons(challenger)[1]).lookType ~= 2 then --alterado v1.6
				  selfAttackCreature(getCreatureSummons(challenger)[1])
				  challenger_turn = challenger_turn + 1
				  afk_time = 0
	            end
			else
				afk_time = afk_time + 0.5
				if change then
					change = false
					challenger_turn = challenger_turn + 1
				end
			end
		end

		if afk_time > afk_limit_time then
			setPlayerStorageValue(focus, 990, -1)
			focus = 0
			selfSay("I have waited too long, come back when you are ready!")
		return true
		end

		if not afk_warning and afk_time > afk_limit_time / 2 then
			selfSay("Where's your pokemon? Let's fight!")
			afk_warning = true
		end


		if #getCreatureSummons(getThis()) == 0 then
			if battle_turn > #pokemons then
				addEvent(doWinDuel, 1000, focus, getThis())
				setPlayerStorageValue(focus, 990, -1)
				focus = 0
			return true
			end
			addEvent(doSummonGymPokemon, 1000, getThis())
		end

		if not hasPokemon(challenger) or challenger_turn >= 7 or challenger_turn > #pokemons then
			selfSay("You lost our duel! Maybe some other time you'll defeat me.")
			setPlayerStorageValue(focus, 990, -1)
			focus = 0
		return true
		end

	end

		local npcpos = getThingPos(getThis())
		local focpos = getThingPos(focus)

		if npcpos.z ~= focpos.z then
			setPlayerStorageValue(focus, 990, -1)
			focus = 0
			selfSay("Bye then.")
		return true
		end

		if (os.clock() - talk_start) > 30 then
			selfSay("Good bye and keep training!")
			setPlayerStorageValue(focus, 990, -1)
			focus = 0
		end

		if getDistanceToCreature(focus) > max_distance then
			setPlayerStorageValue(focus, 990, -1)
			focus = 0
		return true
		end

		local dir = doRedirectDirection(getDirectionTo(npcpos, focpos))	
		selfTurn(dir)
	end
return true
end