Скрипт роблокс студио TowerDefense

Помогите с ошибочкооой,пишет типо на строке 14 ошибка(я про строку где local mapFolder = ServerStorage.Maps:FindFirstChild(votedMap))говорит что argument 1 assempt or nil.в общем надеюсь,что найдется илон маск который спасет меня

Скрипт:
local ReplicatedStorage = game:GetService("ReplicatedStorage")
local ServerStorage = game:GetService("ServerStorage")

local events = ReplicatedStorage:WaitForChild("Events")

local mob = require(script.Parent.Mob)
local info = workspace.Info

local round = {}
local votes = {}

function round.LoadMap()
local votedMap = round.ToggleVoting()
local mapFolder = ServerStorage.Maps:FindFirstChild(votedMap)
if not mapFolder then
mapFolder = ServerStorage.Maps.GrassLand
end

local newMap = mapFolder:Clone()
newMap.Parent = workspace.Map

workspace.SpawnBox.Floor:Destroy()

newMap.Base.Humanoid.HealthChanged:Connect(function(health)
if health <= 0 then
info.GameRunning.Value = false
info.Message.Value = "GAME OVER"
end
end)

return newMap
end

function round.ToggleVoting()

for i= 10, 1 -1 do
info.Message.Value = "Map voting (" .. i .. ")"
print("Map voting (" .. i .. ")")
task.wait(1)
end

local maps = ServerStorage.Maps:GetChildren()
for i, map in ipairs(maps) do
votes[map.Name] = {}
end

local winVote = nil
local winScore = 0
for name, map in pairs(votes) do
if #map > winScore then
winScore = #map
winVote = name
end
end

--if not winVote then
--local n = math.random(#maps)
--winVote = maps[n].Name
--end

--return winVote

end

function round.ProcessVote(player, vote)

for name, mapVotes in pairs(votes) do
local oldVote = table.find(mapVotes, player.UserId)
if oldVote then
table.remove(mapVotes, oldVote)
print("Old vote removed: ", oldVote)
break
end
end

print("Proccessed vote for ", vote)
table.insert(votes[vote], player.UserId)
end
events:WaitForChild("VoteForMap").OnServerEvent:Connect(round.ProcessVote)