Scoreboard creation GM / Gamemode

[Legendahkiin]

I followed [URL="http://wiki.garrysmod.com/page/Basic_scoreboard_creation"]this tutorial[/URL] exactly, yet this still returns an error:

[ERROR] lua/autorun/client/scoreboard.lua:15: attempt to index global 'GAMEMODE' (a nil value)
  1. unknown - lua/autorun/client/scoreboard.lua:15

This only occurs when I'm starting the map -- but the "scoreboard" doesn't even show up.
I tried making it different sizes, nothing changed.

My full code is as follows:

scoreboard = scoreboard or {}

function scoreboard:show()
	--Create the scoreboard here, with an base like DPanel, you can use an DListView for the rows.
	local Frame = vgui.Create( "DPanel" )
	Frame:SetPos( 10, 30 )
	Frame:SetSize( 200, 500 )
	
	function scoreboard:hide()
		-- Here you put how to hide it, eg Base:Remove()
		Frame:Remove()
	end
end

function GM:ScoreboardShow()
	scoreboard:show()
end

function GM:ScoreboardHide()
	scoreboard:hide()
end

EDIT:
Used to work a lot with VGUI earlier (~1 year ago), and never had these problems.
Though I never used the GM functions.

[warlock123]

function GM:ScoreboardShow()
	scoreboard:show()
end

function GM:ScoreboardHide()
	scoreboard:hide()
end

Try getting rid of the GM: prefix and turning them into hooks

[Legendahkiin]

[QUOTE=warlock123;49453537]

function GM:ScoreboardShow()
	scoreboard:show()
end

function GM:ScoreboardHide()
	scoreboard:hide()
end

Try getting rid of the GM: prefix and turning them into hooks[/QUOTE]

Original scoreboard remained.
Sorry, but I give up on this for now.
I'll look through my old files and see if I can't get something to work.