Why won't my script add the players name to my custom player list?

I updated it, This code should be working but it's not, I watched it on youtube, And it work, But this won't work at all.

Here is my code:

local main = script.Parent.Main
local pl = main.PlayerList

pos = 0

function update()
	local getall = pl:GetChildren()
	for i = 1, #getall do
		getall[i].Position = UDim2.new(0,0,0,pos)
		pos = pos + 30
	end
	pos = 0
end


game.Workspace.Players.ChildAdded:connect(function(plr)
	wait(0.1)
	local frm = Instance.new("Frame", pl)
	frm.Name = plr.name
	frm.BackgroundColor3 = Color3.fromRGB()
	frm.BackgroundTransparency = 0.5
	frm.BorderPixelSize = 0
	frm.Size = UDim2.new(0,180,0,25)
	frm.Position = UDim2.new(0,0,0,0)
	
	local img = Instance.new("ImageLabel", frm)
	img.Size = UDim2.new(0,20,0,20)
	img.Position = UDim2.new(0,5,0,3)
	img.Image = "http://www.roblox.com/Thumbs/Avatar.ashx?x=100&y=100&username="..plr.Name
	
	local tl = Instance.new("TextLabel", frm)
	tl.Size = UDim2.new(0,190,0,20)
	tl.BackgroundColor3 = Color3.fromRGB(51, 176, 214)
	tl.BorderSizePixel = 0
	tl.BackgroundTransparency = 0.5
	tl.TextColor3 = Color3.fromRGB(255, 255, 255)
	tl.TextStrokeTransparency = 0
	tl.TextStrokeColor3 = Color3.fromRGB(113, 113, 113)
	tl.TextXAlignment = "Left"
	tl.Text = ""..plr.Name
	tl.Name = plr.Name
	update()
end)

game.Workspace.Players.ChildRemoving:connect(function(plr)
	wait(0.1)
	if pl:FindFirstChild(plr.Name) then
		pl[plr.Name]:remove()
		update()
	end
end)