What's wrong with my script?

I'm trying to get a zombie spawning script but when it spawns, it dies automatically.

waittime = 60 -- 1 min

function StartCountdown()
    waittime = 60 -- Reset the waittime everytime you start a countdown
    for i =1,60 do -- for 1, 60 times do -- This can be done differently, i.e repeat -code- until
    waittime = waittime - 1 -- Minus 1 every second
    wait(1)
end
SpawnZombie() -- Spawn a zombie after the for loop is finished
StartCountdown() -- In Another min another zombie will be spawned
end




function SpawnZombie()
    local Zombie = game.Lighting.Zombie:Clone() -- Assuming its in the lighting and its name is Zombie
    Zombie.Parent = game.Workspace -- You can place the zombie in an appropriate spot and just parent them to workspace when spawning(Easiest way)

    for i,v in pairs(Zombie:GetChildren()) do -- This gets the scripts in the zombie and enables them(Keep the scripts in the Zombie Disabled so they dont brake while in the lighting)
        if v:IsA("Script") then 
            v.Disabled = false
        end
    end
end


StartCountdown() -- Run the function to start the game/round