My script, to show a Gui when a player touches a part doesn't work?

So, I'm trying to make something that when the player walks into the "Hitbox" a Gui in the player's Guis, will turn visible, and then when they walk out it goes back to visible = false.

function inHitbox(thing)
	local player = game.Players:GetPlayerFromCharacter(thing)
	player.PlayerGui.GetInCarGui.TextLabel.Visible = true
	if script.Parent.Hitbox.TouchEnded then
		player.PlayerGui.GetInCarGui.TextLable.Visible = false
	end
end

script.Parent.Hitbox.Touched:connect(inHitbox)

It doesn't work..... Help me? I tryed other things and the output says nothing.