Not Teleporting when time waited?

So in a nutshell the code that warps all players isn't working when the timers done. here is the error script part:

if a >= 30 then
            a = 0
            Timer.Text = "Start!"
            Playing = true
            for i, player in ipairs(game.Players:GetChildren()) do
                player.Character.HumanoidRootPart.CFrame = target
                GunClone.Parent = player.BackPack

            end
        end

and the error message says: ServerScriptService.Teleport:19: bad argument #3 to 'CFrame' (CFrame expected, got Object)