This script works in an empty baseplate, but not when I put it in another game. Why?

So I started off by using this script in an empty baseplate, and it worked perfectly fine. When I put the script in a game that has been published, it won't work. Not sure why.. I tried deleting all the other scripts in that game as well, to no avail. I am desperately stuck, please help.

Here is my code:

local shirts = {
	["1"] = "815849208",
	["2"] = "815849208",
	["3"] = "815846079",
	["4"] = "815845414",
	["5"] = "815844264",
	["6"] = "815843610",
	["7"] = "815843104",
	["8"] = "815841847",
	["9"] = "815861890",
	["10"] = "815834264",
	["11"] = "815833715",
	["12"] = "815832708",
	["13"] = "815831516",
	["14"] = "815831516",
	["15"] = "815831516",
	--["255"] = "447555674",
}
local pants = { --subtract 1 from pants id until you get an image of the net
	["1"] = "815847370",
	["2"] = "815847370",
	["3"] = "815847370",
	["4"] = "815847370",
	["5"] = "815847370",
	["6"] = "815847370",
	["7"] = "815847370",
	["8"] = "815835761",
	["9"] = "815835761",
	["10"] = "815835761",
	["11"] = "815835761",
	["12"] = "815835761",
	["13"] = "815835761",
	["14"] = "815835761",
	["15"] = "815835761",
	--["255"] = "447555803"
}

game.Players.PlayerAdded:connect(function(p)
	if p:IsInGroup(3236293) then  --Unpoke wanted to be added to this
		p.CharacterAdded:connect(function(char)
			wait(1)
			if char:FindFirstChild("Shirt") then
				char.Shirt:Destroy()
			end
			
			if char:FindFirstChild("Pants") then
				char.Pants:Destroy()
			end
			
			local rank = p:GetRankInGroup(3236293)
			local shirt = "http://www.roblox.com/asset/?id="..shirts[tostring(rank)]
			local pants = "http://www.roblox.com/asset/?id="..pants[tostring(rank)]--heres the other part
			
			local newShirt = Instance.new("Shirt",char)
			newShirt.ShirtTemplate = shirt
			
			local newPants = Instance.new("Pants",char)
			newPants.PantsTemplate = pants

		end)
	end
end)

(I commented out the owner's Shirt and Pants to test the script.)