Saving an IntValue help?

I am trying to make a script where it saves the number as you can see on the first line. I'm pretty sure this is the false way to do it but this is all the wiki gave me. I hope this is correct. Any help appreciated. This is a local script in a screen gui. The error is: 'DateStoreService' is not a valid Service name

local DataStore = game:GetService("DateStoreService"):GetDataStore(script.Parent.Number)

game.Players.PlayerAdded:connect(function(player)
	local key = "user_".. player.userId
	DataStore:UpdateAsync(key, function(oldValue)
		local newValue = oldValue or 0
		newValue = newValue + 10
		return newValue
	end)
end)

game.Players.PlayerRemoving:connect(function(player)
	local key = "user_".. player.userId
	DataStore:UpdateAsync(key, function(oldValue)
		local newValue = oldValue
		return newValue
	end)
end)

DataStores don't work from LocalScripts. For that matter, I don't think PlayerRemoving or PlayerAdded work in a LocalScript either.

Usually when you're using PlayerAdded or PlayerRemoving, it's a good hint you shouldn't be using a LocalScript, anyway.