Trying to make my disaster script have GUIs, but none of them work. Can anyone help me?

I've been trying to change the disaster script around to change the countdown and messages to GUIs. I've tried everything and it doesn't work. Any help?

countdownTime = 50
disasterTime = 60 

countdownMessage = "The Next Round Will Begin in %s Seconds" -- The message displayed between disasters. %s will be replaced with the number of seconds left.
disasterMessage = "Round: %s" -- The message displayed when a disaster occurs. %s


items = {}
leaderboard = game.Workspace:findFirstChild("BTS Leaderboard") -- Used to work with my BTS leaderboard
local w = game.Workspace:getChildren()
for i=1,#w do
	if w[i].Name == "leaderboard" and w[i]:findFirstChild("running") ~= nil and w[i]:findFirstChild("points") ~= ni then
		leaderboard = w[i]
	end
end
for i=1,#disasters do
	local item = game.Lighting:findFirstChild(disasters[i])
	if item ~= nil then
		item.Parent = nil
		table.insert(items, item)
	else
		print("Error! ", disasters[i], " was not found!")
	end
end

function chooseDisaster()
	return items[math.random(#items)]
end

function sethint(text)
	local hint = game.StarterGui.Timer:findFirstChild("Timer2")
	game.StarterGui.Timer.Visble = true 
	if (hint ~= nil) then
		game.StarterGui.Timer.Timer2.Text = text
	end
	--print("Hint set to: ", text)
end

function removeHint()
	hint = game.StarterGui.Timer:findFirstChild("Timer2")
	if (hint ~= nil) then game.StarterGui.Time.Timer2.Visible = false
end

function countdown(time)
	sethint (game.StarterGui.Timer.Timer2.Text(countdownMessage, tostring(time)))
	while (time > 0) do
		wait(1) 
		time = time - 1
		game.Workspace.Tick:Play()
		sethint (game.StarterGui.Timer.Timer2.Text(countdownMessage, tostring(time)))
	end
	
	
		
	removeHint()
	return true
end

while true do
	countdown(countdownTime)

	if leaderboard ~= nil and leaderboard:findFirstChild("running") and leaderboard:findFirstChild("points") then -- For use with my BTS leaderboard.
		leaderboard.points.Value = 15 --Points after you survive disasters.
		leaderboard.running.Value = true
	end

	local m = chooseDisaster():clone()

	if disasterMessage ~= nil then
		local msg = Instance.new("Message")
		msg.Name = "DisasterMsg"
		msg.Text = game.StartGui.Round.TextBox.Text(disasterMessage, m.Name)
		msg.Parent = game.Workspace
		wait(3)
		msg.Parent = nil
		game.Workspace.Round:Play()
		function teleAll(x,y,z)

    local pos = Vector3.new(x,y,z)

    for _, plr in pairs(Game:GetService("Players"):GetPlayers()) do

        if plr.Character then

            plr.Character:MoveTo(pos)

        end

    end

end

 
wait(3)
teleAll(3665, 3580.261, 107.2)

		
	end

	m.Parent = game.Workspace
	m:makeJoints()
	wait(disasterTime)
	m:remove()
    game.Workspace.Round:Play()

	if leaderboard ~= nil then -- For use with the bts leaderboard.
		leaderboard.running.Value = false
				function teleAll(x,y,z)

    local pos = Vector3.new(x,y,z)

    for _, plr in pairs(Game:GetService("Players"):GetPlayers()) do

        if plr.Character then

            plr.Character:MoveTo(pos)

        end

    end

end

 

teleAll(-10282.374, 3217.273, -1045.839)
	end
end