" leaderstats is not a valid member of Player "Players.Manby7"?

By the way, this is a local script.

local player = game.Players.LocalPlayer

local Plus = player.PlayerGui.PlusMaterialNotification

player.leaderstats.Steel.Changed:Connect(function()

    local tab = Plus:GetChildren()

    local random = math.random(1,#tab)

    local selected = tab[random]

    print("e")

    selected.Text = "+5 Steel"

    wait(1.3)

    selected.Text = ""

end)

player.leaderstats.Wood.Changed:Connect(function()

    local tab = Plus:GetChildren()

    local random = math.random(1,#tab)

    local selected = tab[random]

    print("e")

    selected.Text = "+5 Wood"

    wait(1.3)

    selected.Text = ""

end)

player.leaderstats.Stone.Changed:Connect(function()

    local tab = Plus:GetChildren()

    local random = math.random(1,#tab)

    print("e")

    local selected = tab[random]

    selected.Text = "+5 Stone"

    wait(1.3)

    selected.Text = ""

end)

Whenever I run the script, I get this error: leaderstats is not a valid member of Player "Players.Manby7" Any help would be greatly appreciated!