My pathfinding doesn't work, nothing comes in the output. Very confused?

dunno why, but this wont work. looking for an answer, thanks if u can help. btw, anything doesnt come in the output. i also found out that it doesn't tag the zombie's humanoid.

local CollectionService = game:GetService("CollectionService")

local zombies = {}

function updateTarget()
	local humans = CollectionService:GetTagged("Humans")
	for _, zombie in pairs(zombies) do
		local target = nil
		local dist = 200
		for _, human in pairs(humans) do
			local root = human.rootPart
			if root and human.Humanoid.Health > 0 and (root.Position - zombie.root.Position).magnitude and human.Parent.Name ~= zombie.char.Name then
				local target = root
				local dist = (root.Position - zombie.root.Position).magnitude
			end
		end
	end
end

spawn(function()
	while wait(1) do
		updateTarget()
	end
end)

function findPath(zombie)
	local x = math.random(-50,-50)
	local z = math.random(-50,-50)
	local destination = Vector3.new(x,0,z)

	local path = game:GetService("PathfindingService"):CreatePath()
	path:ComputeAsync(zombie.root.Position, destination)
	local waypoints = path:GetWaypoints()
	local currentTarget = zombie.target

	for _, waypoint in pairs(waypoints) do
		if path.Status == Enum.PathStatus.Success then
			if waypoint.Action == Enum.PathWaypointAction.Jump then
				zombie.human.Jump = true
			end
			zombie.human:MoveTo(Vector3.new(waypoint.Position))
			local cooldown = zombie.human.MoveToFinished:Wait(1)
			if not cooldown then
				print("Got stuck!")
				zombie.human.Jump = true
				findPath(zombie)
				break
			end
			if not zombie.target then
				break	
			elseif (currentTarget.Position - waypoints[#waypoints].Position).magnitude > 10 or currentTarget ~= zombie.Target then
				findPath(zombie)
				break
			end
		end
		print("Path unsuccessful.")
		zombie.human.Jump = true
		findPath()
	end
end

function moveHandler(zombie)
	if zombie.human.Health > 0 and zombie.target then
		findPath(zombie)
	end
end

function tagHuman(instance)
	local human = instance:FindFirstChildWhichIsA("Humanoid")
	if human then
		CollectionService:AddTag(human,"Humans")
	end
end

workspace.ChildAdded:Connect(tagHuman)

function removeZombie(zombie)
	local index = table.find(zombies, zombie)
	table.remove(zombies,index)
	wait(5)
	zombie.char:Destroy()
	zombie.clone.Parent = workspace
end

function addZombie(zombieHumanoid)
	table.insert(zombies, {
		char = zombieHumanoid.Parent,
		root = zombieHumanoid.RootPart,
		human = zombieHumanoid,
		target = nil,
		clone = zombieHumanoid.Parent:Clone()
	})
	for _, zombie in pairs(zombies) do
		if zombie.human == zombieHumanoid then
			zombieHumanoid.Died:Connect(removeZombie(zombie))
			for _, v in pairs(zombie.char:GetDescendants()) do
				if v:IsA("BasePart") and v:CanSetNetworkOwnership() then
					v:SetNetworkOwnership(nil)
				end
			end
			spawn(moveHandler, zombie)	
		end
	end
end

CollectionService:GetInstanceAddedSignal("Zombie"):Connect(function(zombieHumanoid)
	addZombie(zombieHumanoid)	
end)

function initialize()
	for _, v in pairs(CollectionService:GetTagged("Zombie")) do
		local found = false
		for _, x in pairs(zombies) do
			if x.human == v then
				found = true
			end
		end
		if not found then
			addZombie(v)	
		end
	end
end

function attack(zombie)
	local human = zombie.target.Parent:WaitForChild("Humanoid")
	human:TakeDamage(math.random(15,25))
end

spawn(function()
	while wait(0.5) do
		for _, zombie in pairs(zombies) do
			if zombie.target then
				if (zombie.target.Position - zombie.root.Position).magnitude < 5 then
					attack(zombie)
				end
			end
		end
	end
end)