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.)