Why does it say that readyburger is not a valid member of workspace?

My script is when an npc named "Cook2" steps on a part a burger appears, but it says that readyburger is not a valid member of workspace even though it it.

local rb = game.Workspace:FindFirstChild("ReadyBurger")
if rb then
	script.Parent.Touched:Connect(function(hit)
		if hit.Parent.Name == "Cook2" then
			game.Workspace.ReadyBurger.Transparency = 0
		end
	end)
end

Not a Valid Member of Workspace means that it either doesn't exist or it has been moved. Make sure the part's parent is workspace or game.Workspace. Also make sure you written the name correctly.