GUI Not Showing?

So i recently took some help from others to create a "url bar" in my computer, here's the code.

--- Configuration ---
plr = game.Players.LocalPlayer
comp = plr.PlayerGui.NNet
notice = comp.Notice

-- Domains --
youtube = comp.Websites.YouTube
roblox = comp.Websites.Roblox
twitter = comp.Websites.Twitter

-- Code --
comp.MainFrame.UrlBar.FocusLost:connect(function()
    input = comp.MainFrame.UrlBar.Text
if input == "youtube.rbx" or input == "www.youtube.rbx" or input == "http://youtube.rbx" then
	youtube.Visible = true
	notice.Visible = true
	notice:TweenPosition(UDim2.new(0, 100,0, 300), "Out", "Quad")
	wait(4)
	notice:TweenPosition(UDim2.new(0, 0,0, 0), "Out", "Quad")
	wait(2)
	notice.Visible = false
elseif input == "roblox.rbx" or input == "www.roblox.rbx" or input == "http://roblox.rbx" then
	roblox.Visible = true
	notice.Visible = true
	notice:TweenPosition(UDim2.new(0, 100,0, 300), "Out", "Quad")
	wait(4)
	notice:TweenPosition(UDim2.new(0, 0,0, 0), "Out", "Quad")
	wait(2)
	notice.Visible = false
elseif input == "twitter.rbx" or input == "www.twitter.rbx" or input == "http://twitter.rbx" then
	twitter.Visible = true
	notice.Visible = true
	notice:TweenPosition(UDim2.new(0, 100,0, 300), "Out", "Quad")
	wait(2)
	notice:TweenPosition(UDim2.new(0, 0,0, 0), "Out", "Quad")
	wait(2)
	notice.Visible = false
else
	comp.MainFrame.UrlBar.Visible = false
	comp.MainFrame.UrlError.Visible = true
	comp.Websites.YouTube.Visible = false
	comp.MainFrame.UrlError.Text = "ERROR: Url Not Found!"
	wait(4)
	comp.MainFrame.UrlError.Visible = false
	comp.MainFrame.UrlBar.Visible = true
	end
end)

Here's my problem,

The script works in Solo Mode but wont work in a server (clicking play out of studio), so i am trying to figure out why that is... There are no errors, i've tried if statements for all of them, it works either way.

So if you could please help me with trying to figure out why my gui doesn't work in an actual server

=============

New Errors (5/17/2014)

13:50:54.356 - Notice is not a valid member of ScreenGui
13:50:54.357 - Script 'Players.Player1.PlayerGui.NNet.MainFrame.UrlBar.DomainCheck', Line 4
13:50:54.357 - Stack End

BUT! Notice is a valid member.

Screenshot: puu.sh/8Q9iW.png

I setup a quick gui, of what was in the gui-picture you uploaded.

Classic case of ROBLOX being too slow to load guis, or.. rather Local Scripts running before the Guis have loaded.

Here you go.

--- Configuration ---
plr = game.Players.LocalPlayer
comp = plr.PlayerGui.NNet
repeat wait() until comp:FindFirstChild("Notice")
notice = comp.Notice

-- Domains --
youtube = comp.Websites.YouTube
roblox = comp.Websites.Roblox
twitter = comp.Websites.Twitter

-- Code --
comp.MainFrame.UrlBar.FocusLost:connect(function()
    input = comp.MainFrame.UrlBar.Text
if input == "youtube.rbx" or input == "www.youtube.rbx" or input == "http://youtube.rbx" then
    youtube.Visible = true
    notice.Visible = true
    notice:TweenPosition(UDim2.new(0, 100,0, 300), "Out", "Quad")
    wait(4)
    notice:TweenPosition(UDim2.new(0, 0,0, 0), "Out", "Quad")
    wait(2)
    notice.Visible = false
elseif input == "roblox.rbx" or input == "www.roblox.rbx" or input == "http://roblox.rbx" then
    roblox.Visible = true
    notice.Visible = true
    notice:TweenPosition(UDim2.new(0, 100,0, 300), "Out", "Quad")
    wait(4)
    notice:TweenPosition(UDim2.new(0, 0,0, 0), "Out", "Quad")
    wait(2)
    notice.Visible = false
elseif input == "twitter.rbx" or input == "www.twitter.rbx" or input == "http://twitter.rbx" then
    twitter.Visible = true
    notice.Visible = true
    notice:TweenPosition(UDim2.new(0, 100,0, 300), "Out", "Quad")
    wait(2)
    notice:TweenPosition(UDim2.new(0, 0,0, 0), "Out", "Quad")
    wait(2)
    notice.Visible = false
else
    comp.MainFrame.UrlBar.Visible = false
    comp.MainFrame.UrlError.Visible = true
    comp.Websites.YouTube.Visible = false
    comp.MainFrame.UrlError.Text = "ERROR: Url Not Found!"
    wait(4)
    comp.MainFrame.UrlError.Visible = false
    comp.MainFrame.UrlBar.Visible = true
    end
end)