Map Chooser after Round end error - help!

[jcsc123456]

I have a working round timer and all that, but after the round ends it fails to call the function.

local MapChooser = nil 
function GM:ShowMapChooser( gm_table )
 
	if ( MapChooser ) then MapChooser:Remove() end
 
	MapChooser = vgui.CreateFromTable( vgui_Splash )
	MapChooser:SetHeaderText( "Which Map?" )
	MapChooser:SetHoverText( "Which of these maps do you want to play this gamemode on?" );
 
	for _, v in SortedPairs( gm_table.maps ) do
 
		local func = function() RunConsoleCommand( "playgamemode", gm_table.name, v ) end
		local btn = MapChooser:AddSelectButton( v, func )
		btn.m_colBackground = Color( 120, 255, 100 )
 
	end
 
	MapChooser:AddCancelButton()
	MapChooser:MakePopup()
	MapChooser:NoFadeIn()
 
end

That is the function above

Below is the round end function

function round.End()
		function GM:ShowMapChooser() end
		
	round.Broadcast("Round over! Next round in " .. round.Break .. " seconds!")
	timer.Simple(round.Break, round.Begin)
end

After the round ends I get this error.

Timer Failed! [Simple][@gamemodes/tdm/gamemode/init.lua (line 200)]

[ERROR] gamemodes/tdm/gamemode/init.lua:228: attempt to index global 'GM' (a nil value)
  1. unknown - gamemodes/tdm/gamemode/init.lua:228

I am still learning LUA, so if it is really obviously I apologize haha!

If someone would know how to fix that, that would be awesome! Thanks!

[MysteryPancake]

I think the problem is this bit:

function round.End()
		function GM:ShowMapChooser() end
		
	round.Broadcast("Round over! Next round in " .. round.Break .. " seconds!")
	timer.Simple(round.Break, round.Begin)
end

The way you're using functions is a bit strange and I have a feeling they're not being ended properly- try this:

function round.End()
	GM:ShowMapChooser() -- you don't need to say it's a function or end it
		
	round.Broadcast("Round over! Next round in " .. round.Break .. " seconds!")
	timer.Simple(round.Break, round.Begin)
end

[editline]25th May 2016[/editline]

If that still gives the same error, you may want to try using [img]http://wiki.garrysmod.com/favicon.ico[/img] [url=http://wiki.garrysmod.com/page/hook/Call]hook.Call[/url] instead