I have a 'NIL' value in my script. Help?

I'm just confused since there clearly is the variable, but it's saying it's NIL? Okay, here's the error:

Workspace.Essential Scripts.Checkpoint Script:9: attempt to index local 'sl' (a nil value)

Here's the script.

function oa(object) local player = game.Players:playerFromCharacter(object) if player ~= nil then local ls = player.leaderstats local sl = game.Workspace:FindFirstChild(ls.Stage.Value) print("gah") object.Torso.CFrame = object.Torso.CFrame + Vector3.new(0,3,0) wait() object.Torso.CFrame = sl.CFrame + Vector3.new(0,3,0) end end

function oe(object) if object.className == "Player" then local ack = Instance.new("IntValue") ack.Name = "leaderstats" local ack2 = Instance.new("IntValue") ack2.Name = "Stage" ack2.Value = 1 ack2.Parent = ack ack.Parent = object end end

game.Players.ChildAdded:connect(oe) game.Workspace.ChildAdded:connect(oa)