ContentProvider:PreloadAsync() is not working or something?

um I have try many times but the shirt is not being loaded. so I make this to check

local check = false
repeat
	game:GetService("RunService").Stepped:Wait()
	coroutine.resume(coroutine.create(function()
		print("umm")
		local s = game:GetService("ContentProvider")
		s:PreloadAsync({"http://www.roblox.com/asset/?id=268265637", "http://www.roblox.com/asset/?id=765106897"},function()
			check = true
			print("ok")
		end)
	end))
until check == true

And this is the output.

umm (x3167718)

;-;