Why Doesn't this work?

I have this script, but it won't award the Player Point to the player:

local buyButton = game.Workspace.Buttons.BuyButton.SurfaceGui.TextButton
local user = game.Players.LocalPlayer.userId
buyButton.MouseButton1Click:connect(function()
	local productId = 19251902
	Game:GetService("MarketplaceService"):PromptProductPurchase(game.Players.LocalPlayer, productId)
	local PointsService = Game:GetService("PointsService")
	game.Players.LocalPlayer.leaderstats.Diamonds.Value = game.Players.LocalPlayer.leaderboard.Diamonds.Value + 10
	PointsService:AwardPoints(user, 1)
end)

Everything is in a LocalScript, the purchase and the Diamonds work fine, but the points don't. Why?

it needs to be

local buyButton = game.Workspace.Buttons.BuyButton.SurfaceGui.TextButton
local user = game.Players.LocalPlayer.userId
buyButton.MouseButton1Click:connect(function()
    local productId = 19251902
    Game:GetService("MarketplaceService"):PromptProductPurchase(game.Players.LocalPlayer, productId)
    local PointsService = Game:GetService("PointsService")
    game.Players.LocalPlayer.leaderstats.Diamonds.Value = game.Players.LocalPlayer.leaderstats.Diamonds.Value + 10
    PointsService:AwardPoints(user, 1)
end)

simple error you wrote leaderboard instaed of stats