Http Service issues?

So, I'm making a Player information module, and essentially what this does is get the player information from their profile using a Roblox Http Service proxy. For some reason, it is erroring telling me that It can't find the string I'm looking for to get a user's join date. Can someone help me with this? Here's the code.

--\\ Player Information Module
--\\ Use this to get the information of a player. ie: Join Date, Place visits, etc 
--\\ HttpService must be enabled for this to work to its full extent.

local Player = {}

local HttpService = game:GetService('HttpService')

function Player:GetJoinDate(Id)
	local Link = 'http://rproxy.pw/users/'..Id..'/profile' -- The link to the players profile.
	local String = [[<p class="rbx-lead">%d+/%d+/%d+</p>]] -- A string to help find the join date. (Got from inspect element)
	local Find = HttpService:GetAsync (Link, true):match(String) -- Finds the string.
	local JoinDate = Find:match('%d+/%d+/%d+') -- Matches the join date thats inside the string.
	return JoinDate
end

return Player

Here is what it is erroring.

15:55:43.487 - Content failed because HTTP 403 (HTTP/1.1 403 Asset is not trusted for this place) 15:55:45.844 - ServerScriptService.ModuleScript:13: attempt to index local 'Find' (a nil value) 15:55:45.845 - Stack Begin 15:55:45.845 - Script 'ServerScriptService.ModuleScript', Line 13 - method GetJoinDate 15:55:45.845 - Script 'ServerScriptService.Script', Line 17 15:55:45.846 - Stack End 15:57:30.090 - Auto-Saving... 16:02:30.084 - Auto-Saving...