Cant change mouse curser?

So, as you can tell by the code it's trying to change the mouse curser. However, studio says it's unable to change the curser.

The code is running on a local script in a Gui.

Code:

mhid = false
mouse = game.Players.LocalPlayer:GetMouse()
mouse.KeyDown:connect(function(key)
	key = string.lower(key)
	if string.byte(key) == 113 then
		if not mhid then
			mhid = true
			mouse.Icon = "http://www.roblox.com/asset/?id=20686724"
		elseif mhid then
			mhid = false
			mouse.Icon = ""
		end
	end
end)

Output: Cannot set Icon of a PlayerMouse