I keep getting : bad argument #2 (string expected, got nil), any help?

I keep getting this error : Players.SpoostyGuy.PlayerGui.ScreenGui.Shop.ImageButton.Script:5: bad argument #2 (string expected, got nil)

my code:

script.Parent.MouseButton1Click:Connect(function(plr)
    local playerTouch = game.Players[plr]

    if playerTouch.leaderstats.Coins.Value >= 60 then
        print("Bought!")
        playerTouch.leaderstats.Coins.Value = playerTouch.leaderstats.Coins.Value -60
    else
        print("Not ENought Money!!")
    end
end)

pcall(function(msg)
    warn(msg)
end)

Also, I am using a DataStore and the leaderboard does exist

Line 5 is fine but Line 2 is the problem

Help would be appreciated