Data is not a valid member of player?

The title says my problem with the script I'm using, can someone please tell me the problem. And if you require the script I will provide it :)

game.Players.PlayerAdded:connect(function(Player) 
    local Data = Instance.new("IntValue",Player)
    Data.Name = "Data" 
    local XP = Instance.new("IntValue",Data) 
    XP.Name = "XP" 
    XP.Value = 0
    local Level = Instance.new("IntValue",Data) 
    Level.Name = "Level" 
    Level.Value = 1 
    local Tries = Instance.new("IntValue",Data)
    Tries.Value = 10
    Tries.Name = "Tries"
    local Data = Instance.new("IntValue",Player)
    Data.Name = "leaderstats"
    local Level = Instance.new("IntValue",Data)
    Level.Name = "Level"
    Level.Value = 1
    XP.Changed:connect(function() XPChange(Player,XP,Level) end)

end)

function XPChange(Player,XP,Level) 
    if XP.Value >= Level.Value*150  then 
        XP.Value = 0 
        Level.Value = Level.Value+ 1
    end
end