Why wont my currency Exchange System work?

I'm currently working on a currency exchange system that is ran by 2 scripts and you just put the amount you want to exchange and you click a button and when that happens it fires an even sending the player and the amount the player wants to receive and in the script that does that I have a Variable that holds a value calculated from doing this equation Receiving.Value * 1000, but it doesn't do that and I get the error Value is not a valid member of Player "Players.vincentthecat1.

--###----------[[FIRESEVENT]]----------###--

ExchangeButton.MouseButton1Down:Connect(function()
    ExchangeEvent:FireServer(Player, Receiving)
end)

--###----------[[COLLECTSDATA]]----------###--

ExchangeEvent.OnServerEvent:Connect(function(Player, Receiving)
local Cost = Receiving.Value * 1000 --The Line the error comes from.
    if Player.leaderstats.Bux.Value >= Cost then
        Player.leaderstats.Bux.Value -=Cost
        Player.leaderstats.Gems.Value +=Receiving
    end
end)