I don't seem to get DataStoreService working on Roblox

Question

I cannot get to save data in a roblox game.

local players = game:GetService("Players") 
local dss = game:GetService("DataStoreService")
local gameData = dss:GetDataStore("Nara")
players.PlayerAdded:Connect(function(player) 


    local leaderstats = Instance.new("Folder") 
    leaderstats.Name = "leaderstats" 
    leaderstats.Parent = player 


    local coins = Instance.new("IntValue")
    coins.Name = "Coins"
    coins.Parent = leaderstats

    local success, result = pcall(function()
        local r = gameData:GetAsync(player.UserId)["Coins"]
        
        return r
    end)

    if success then
        print("success: " .. result)
        coins.Value = result
    else
        print(result)
    end




end)

players.PlayerRemoving:Connect(function(player)
    print("player removed")
    local key = player.UserId
    
    local data = {
        ["Coins"] = player:WaitForChild("leaderstats").Coins.Value
    }
    
    local success, err = pcall(function()
        gameData:SetAsync(key, data)
    end)

    if success then
        print("Data saved successfully")
    else
        print("Failed to save data with error: ", err)
    end
    
end)



game.ReplicatedStorage.Buy.OnServerInvoke = function(player, item)
    if not player:FindFirstChild(item) then
        if player.leaderstats.Coins.Value >= game.ReplicatedStorage.Items:WaitForChild(item).cost.Value then
            player.leaderstats.Coins.Value = player.leaderstats.Coins.Value - game.ReplicatedStorage.Items:WaitForChild(item).cost.Value
            local owned = Instance.new("BoolValue")
            owned.Name = item
            owned.Parent = player
            player.Backpack:ClearAllChildren()
            game.ReplicatedStorage.Items:WaitForChild(item):Clone().Parent = player.Backpack
            return item
        else
            return "not enough coins"
        end
    else
        player.Backpack:ClearAllChildren()
        game.ReplicatedStorage.Items:WaitForChild(item):Clone().Parent = player.Backpack
        return "owned " .. item
    end
end

i tried more ways i dont know whats wrong.

I was expecting for the Coins IntValue to be saved then loaded when player joins. I tried everything but didnt get it to work. The value is created and nothing destroyed it. The code gets stuck at pcall for saving, tried to see where using print. Thanks