GUI button not working can anyone help me?

Hi, I made a Menu GUI in with it has 4 buttons. I made a script that when you click the button a GUI will popup and i made a close button but both of those button does not work. Please tell me why it is not working. I made the script using Local Script.

 AboutGUI = script.Parent.AboutGUI
Close = AboutGUI.Close

function CloseAboutGUI()
	AboutGUI.visible =  false
	
end

function AboutGUIPopup()
	if AboutGUI.Visible ==  false then
	   AboutGUI.visible =  true
	else
		AboutGUI.Visible = false
    end
end

About.MouseButton1Down:connect(AboutGUIPopup)
Close.MouseButton1Down:connect(CloseAboutGUI

Thank You for reading or answering :)