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