Error while loading datastore data?

local ds = game:GetService("DataStoreService")
local players = game:GetService("Players")

players.PlayerAdded:connect(function(player)
	local userid = "user_"..player.UserId
	local money_store = ds:GetDataStore("Money")
	local money_stats = player:WaitForChild("leaderstats").Money.Value
	local newmoney = money_store:GetAsync(userid)
	print(newmoney)
	player:WaitForChild("leaderstats").Money.Value = newmoney

end)

players.PlayerRemoving:connect(function(player)
	local userid = "user_"..player.UserId
	local money = ds:GetDataStore("Money")
	local money_stats = player:WaitForChild("leaderstats").Money.Value
	print(money_stats)
	money:SetAsync(userid,money_stats)
end)

Why when loading data I get nil when I use print (newmoney)?

leaderstats & Money thing doesn't create when a player joins. Yeah so I rewrote it:

local ds = game:GetService("DataStoreService")
local players = game:GetService("Players")

players.PlayerAdded:connect(function(player)
    local userid = "user_"..player.UserId
    local money_store = ds:GetDataStore("Money")
    local leaderstats = instance.new("IntValue", player) -- Create new instance and parent it to player

    leaderstats.Name = "leaderstats" -- Name previous instance leaderstats

    local money_stats = instance.new("IntValue", leaderstats) -- Create new instance and parent it to leaderstats

    money_stats.Name = "Money"  -- Name previous instance Money

    money_stats.Value = money_store:GetAsync(userid) or 0 -- Set money value to datastore or set it to 0

    print(money_stats.Value) -- print money value
end)

players.PlayerRemoving:connect(function(player)
    local userid = "user_"..player.UserId
    local money = ds:GetDataStore("Money")
    local money_stats = player:WaitForChild("leaderstats").Money
    print(money_stats.Value)
    money:SetAsync(userid,money_stats.Value)
end)