What do I have wrong? I need some help!

I am trying to make a Hunger Game's countdown script, What's supposed to happen is that when I say the command, (Only certain people can, just like a holo brick used for doors in wargroup places)there would be a BilboardGUI that turns on when the command is said, and does a countdown (Decals, not text) with a sound that plays for 1 second, for ten seconds, there is a hint on the top of the screen that welcomes the players before the countdown starts, and when the countdown ends, while they tell you the numbers the countdown it's at, the bilboardgui disables itself afterwards, and the command can be run again. Can anybody help? I don't see the errors.

Tree: Workspace Countdown Script Music Brick BillboardGui ImageLabel

local sound = script.Music
local waitingTime = script.Music.TimeLength

local cd10 = "http://www.roblox.com/asset/?id=322217722"
local cd9 = "http://www.roblox.com/asset/?id=322217742"
local cd8 = "http://www.roblox.com/asset/?id=322217773"
local cd7 = "http://www.roblox.com/asset/?id=322217789"
local cd6 = "http://www.roblox.com/asset/?id=322217805"
local cd5 = "http://www.roblox.com/asset/?id=322217825"
local cd4 = "http://www.roblox.com/asset/?id=322217848"
local cd3 = "http://www.roblox.com/asset/?id=322217906"
local cd2 = "http://www.roblox.com/asset/?id=322217906"
local cd1 = "http://www.roblox.com/asset/?id=322217967"

admins == {"EternaAurora","Duskriser","Player","Player1"} --Admin names here



------------------------------------------------------------------------------------------------------------------------




function isAdmin(name) 
		for i,v in pairs(admins) do 
			if name:lower() == v:lower() then return true end
		end 
	return false 
end 


local countdownGui=script.Parent.BillboardGui
	game.Players.PlayerAdded:connect(function(p) 
	if isAdmin(p.Name) then 
		p.Chatted:connect(function(msg) 
		
		
		if msg == ":start countdown" then
			--
			script.Parent.BillboardGui.ImageLabel.Visible = true
			--
			sound.Play()
			script.Parent.BillboardGui.ImageLabel.Image = cd10
			wait (waitingTime)
			--
			sound.Play()
			script.Parent.BillboardGui.ImageLabel.Image = cd9
			wait (waitingTime)
			--
			sound.Play()
			script.Parent.BillboardGui.ImageLabel.Image = cd8
			wait (waitingTime)
			--
			sound.Play()
			script.Parent.BillboardGui.ImageLabel.Image = cd7
			wait (waitingTime)
			--
			sound.Play()
			script.Parent.BillboardGui.ImageLabel.Image = cd6
			wait (waitingTime)
			--
			sound.Play()
			script.Parent.BillboardGui.ImageLabel.Image = cd5
			wait (waitingTime)
			--
			sound.Play()
			script.Parent.BillboardGui.ImageLabel.Image = cd4
			wait (waitingTime)
			--
			sound.Play()
			script.Parent.BillboardGui.ImageLabel.Image = cd3
			wait (waitingTime)
			--
			sound.Play()
			script.Parent.BillboardGui.ImageLabel.Image = cd2
			wait (waitingTime)
			--
			sound.Play()
			script.Parent.BillboardGui.ImageLabel.Image = cd1
			wait (waitingTime)
			--
			script.Parent.BillboardGui.ImageLabel.Visible = false
			
		end 
	
		
end) 
end 
end)

Unfortunately, Hints don't exist anymore. This might be your issue. qq