Works in the roblox studio, but not in real game roblox game, or sever?

Works in studio, but not real game, I am pretty novice on roblox dev, so i have no idea how to fix this.

position = script.Parent.Position local frame = Instance.new("CFrameValue") frame.Name = "OriginCFrame" frame.Value = script.Parent.CFrame frame.Parent = script.Parent

local object = Instance.new("ObjectValue") object.Value = script.Parent

seat = script.Parent seat.Direction.cframe = seat.CFrame

function onSitUp(child, hopper, gui, plane) if child.Parent == nil then if seat.DropOnJump.Value == true then seat.Direction.maxTorque = Vector3.new(0,0,0) seat.Thrust.maxForce = Vector3.new(0,0,0) end hopper.Parent = script hopper.Active = false gui.Parent = script script.Parent.Locked = false script.Parent.Parent = game.Workspace if seat.EngineSound.Value > 0 then seat["EngineSound".. seat.EngineSound.Value].SoundScript.Disabled = true end end end

function onChildAdded(part) if part.className == "Weld" then local torso = part.Part1 if torso ~= nil then

        local char = torso.Parent
        local player = game.Players:GetPlayerFromCharacter(char)
        if player ~= nil then
            local hopper = script["Aircraft"]
            hopper.Parent = player.Backpack
            local GUI = script["Controls"]
            GUI.Parent = player.PlayerGui
            part.AncestryChanged:connect(function(child) onSitUp(child, hopper, GUI, script.Parent) end) 
            if seat.Speed.Value < seat.MinSpeed.Value then
                seat.Speed.Value = seat.MinSpeed.Value
            end
            if seat.EngineSound.Value > 0 then
            seat["EngineSound".. seat.EngineSound.Value].Pitch = seat["EngineSound".. seat.EngineSound.Value].BasePitch.Value/100
            seat["EngineSound".. seat.EngineSound.Value].SoundScript.Disabled = false
            end
        end

        local parent = torso.Parent
        if parent ~= nil then
            script.Parent.Locked = true
            script.Parent.Parent = parent
        end
    end
end

end

seat.ChildAdded:connect(onChildAdded)