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)