Doggo army f3x Leaked by SAD F3X not working

--// Doggo Army F3X BY ItsKittyyyGD! \\--
-- (still some broken dm me at discord to fix some bugs) --
-- Version: 1.0.0 (beta leaked by ItsKittyyyGD),soon more versions will be private and u need be a important person for me to get it
-- CODE/SOURCE (OPEN)

local Players = game:GetService("Players")
local UIS = game:GetService("UserInputService")
local RunService = game:GetService("RunService")
local ReplicatedStorage = game:GetService("ReplicatedStorage")

local player = Players.LocalPlayer
local gui = Instance.new("ScreenGui", player:WaitForChild("PlayerGui"))
local introFinished = false

function NotificationScript(txt)
	local label = Instance.new("TextLabel", gui)
	label.Size = UDim2.new(0.9, 0, 0, 19)
	label.Position = UDim2.new(0.05, 0, 0.1, 0)
	label.BackgroundTransparency = 1
	label.TextColor3 = Color3.fromRGB(255, 255, 255)
	label.TextSize = 11
	label.Font = Enum.Font.Code
	label.TextXAlignment = Enum.TextXAlignment.Left

	task.spawn(function()
		for i = 1, #txt do
			label.Text = string.sub(txt, 1, i)
			task.wait(0.03)
		end
		task.wait(5)
		for i = #txt, 1, -1 do
			label.Text = string.sub(txt, 1, i)
			task.wait(0.02)
		end
		label:Destroy()
		if txt:find("Doggo Army F3X") then
			introFinished = true
		end
	end)