Why does my floodcheckwarning Not Working?

local StarterGui = game:GetService("StarterGui")
local player = game:GetService("Players").LocalPlayer
local muteLength = tonumber(script.Name)

StarterGui:SetCoreGuiEnabled('Chat',false)
wait(muteLength)
StarterGui:SetCoreGuiEnabled('Chat',true)

script:Destroy()

And Before you ask, Yes i do have a main script, I think is working! this is my main Script:

local muteAt = 10 
local muteDuration = 60 
local timePeriod = 40   
if script.Parent == workspace then 
	script.Parent = game:GetService("ServerScriptService")
end

local Players = game:GetService("Players")
local chatBucket = {}

function mute(player)
	local character = player.Character
	if character and not character:FindFirstChild("FloodcheckWarning") then
		local warning = script:FindFirstChild("FloodcheckWarning"):Clone()
		warning.Name = tostring(muteDuration)
		warning.Disabled = false
		warning.Parent = character
	end
end

function onChatted(player)
	local chats = (chatBucket[player] or 0) + 1
	if (chats > muteAt) then
		mute(player)
	end
	chatBucket[player] = chats
end

function onPlayerAdded(player)
	player.Chatted:connect(function(msg)
		onChatted(player)
	end)
end

Players.PlayerAdded:connect(onPlayerAdded)

while wait(timePeriod) do
	chatBucket = {}
end