Why my map changer dosent work?

im trying to make a map changer that changes a map then teleports a player to it. i made this code but its broken

local time_between_each_map = 43
local time = 1
local w = game.Workspace:GetChildren()
for i = 1, #w do 
if w[i].ClassName == "Message" or w[i].ClassName == "Hint" then 
w[i]:Remove()
end 
end 

while true do 
local h = Instance.new("Hint")
local m = Instance.new("Message")
local maps = game.Lighting.Big:GetChildren()
h.Parent = workspace
repeat h.Text = time.. " seconds left before new map."
time = time - 1
wait(1)
until time == 0
local w = game.Workspace:GetChildren()
for i = 1, #w do 
if game.Lighting.Big:findFirstChild(w[i].Name) then 
w[i]:Remove()
end 
end 
h:Remove()
m.Parent = workspace
local pm = maps[math.random(1,#maps)]
local map = pm:Clone()
map.Parent = workspace
map:makeJoints()
m.Text = "New Stage: " ..map.Name
time = time_between_each_map
wait(1)
m:Remove()
wait(0.2)
pos = -127.708, 35.319, 159.171
WaitTime = 46
dft = {} 

function GetPlayers()
local c = game.Players:GetChildren() 
for i = 1, #c do 
table.insert(dft, c[i].Name) 
end 
end

function Randomize()
GetPlayers()
local d = math.random(1, #dft) 
local s = d 
local m = Instance.new("Message", game.Workspace) 
m.Text = "The random player is ... "..dft[s].."!" 
wait(2.1) 
m:Remove()
local rndm = game.Players:FindFirstChild(dft[s])
if (rndm ~= nil) then 
local Player = rndm.Character
Player:MoveTo(Vector3.new(127.708, 35.319, 159.171))
end
end

while true do
wait(46)
Randomize()
end

whats wrong with it?