my about gui and code generally wont work how to fix?

im trying to make an about the game thing and when you press the button its supossed to make a frame visble value true and a bool value true i dont know why it wont work

heres the code

local ABOUTButton = script.Parent
local IsOpenBool = script.Parent.IsOpen

local function Open()
	game.StarterGui.MENU.ABOUTBACKROUND.Visible = true
	IsOpenBool.Value = true
end

local function Checkifopen()
	if IsOpenBool.Value == true then
		IsOpenBool.Value = false
		game.StarterGui.MENU.ABOUTBACKROUND.Visible = false
	end
end

ABOUTButton.MouseButton1Click:Connect(function()
	Open()
	Checkifopen()
end)

Instead of game.StarterGui use Player.PlayerGui. StarterGui is not visible to the player, all that it does is whenever you spawn it clones everything inside to PlayerGui

READ: Overall this is a good script aside from the errors. First, this needs to be in a local script(which it is probably). Also, the main problem with the script is that you tried to get to the gui through startergui(a common mistake), if this is a local script(which it has to be to work and also you should always use localscripts for guis), then you can get to the player and their gui through: game.Players.LocalPlayer.StarterGui, the rest is exactly what is in startergui. Third of all, I put everything into a single mouseclick function to make it more simple. Basically, this edited version of your script activates a function that checks if it is either open or closed on mouseclick. Hope this helped :)

	local ABOUTButton = script.Parent
	local IsOpenBool = script.Parent.IsOpen
	 
	local function OpenorClose() -- this function is for both opening and closing using ifs
   
	if IsOpenBool.Value == false then -- if it is closed then open it
	game.Players.LocalPlayer.PlayerGui.ScreenGui.MENU.ABOUTBACKROUND.Visible = true

	   	 
		IsOpenBool.Value = true 
	
	end
	    elseif IsOpenBool.Value == true then --use elseif because there is already an if in the function
	        IsOpenBool.Value = false  game.Players.LocalPlayer.PlayerGui.ScreenGui.MENU.ABOUTBACKROUND.Visible = false
	    end
	end
	 
	 ABOUTButton.MouseButton1Click:Connect(OpenorClose)

Note: There may be minor typing mistakes in the script