attempt to call global 'addButtons' (a nil value) - lua

Question

I need help with a really annoying error I've been getting with my GMOD gamemode. I am trying to make a custom menu, but I get this error:
[ERROR] gamemodes/tdm/gamemode/custom_menu.lua:20: attempt to call global 'addButtons' (a nil value)
1. gameMenu - gamemodes/tdm/gamemode/custom_menu.lua:20
2. unknown - gamemodes/tdm/gamemode/custom_menu.lua:32
3. include - [C]:-1
4. unknown - gamemodes/tdm/gamemode/cl_init.lua:3
Here is my code:
custom_menu.lua
local Menu
function gameMenu()
if(Menu == nil) then
Menu = vgui.Create("DFrame")
Menu:SetSize(750, 500)
Menu:SetPos(ScrW() / 2 - 325, ScrH() / 2 - 250)
Menu:SetTitle("Gamemode Menu")
Menu:SetDraggable(true)
Menu:ShowCloseButton(false)
Menu:SetDeleteOnClose(false)
Menu.Paint = function()
surface.SetDrawColor(60, 60, 60, 255)
surface.DrawRect(0, 0, Menu:GetWide(), Menu:GetTall())
surface.SetDrawColor(40, 40, 40, 255)
surface.DrawRect(0, 24, Menu:GetWide(), 1)
end
addButtons(Menu)
gui.EnableScreenClicker(true)
else
if(Menu:IsVisible()) then
Menu:SetVisible(false)
gui.EnableScreenClicker(false)
else
Menu:SetVisible(true)
gui.EnableScreenClicker(true)
end
end
end
concommand.Add("open_game_menu", gameMenu())
function addButtons(Menu)
local playerButton = vgui.Create("DButton")
playerButton:SetParent(Menu)
playerButton:SetText("")
playerButton:SetSize(100, 50)
playerButton:SetPos(0, 25)
playerButton.Paint = function()
--Color of entire button
surface.SetDrawColor(50, 50, 50, 255)
surface.DrawRect(0, 0, playerButton:GetWide(), playerButton:GetTall())
--Draw Bottom and Right borders
surface.SetDrawColor(40, 40, 40, 255)
surface.DrawRect(0, 49, playerButton:GetWide(), 1)
surface.DrawRect(99, 0, 1, playerButton:GetTall())
--Draw Text
draw.DrawText("Player", "DermaDefaultBold", playerButton:GetWide() / 2, 17, Color(255, 255, 255, 255), 1)
end
playerButton.DoClick = function(playerButton)
local playerPanel = Menu:Add("PlayerPanel")
end
local shopButton = vgui.Create("DButton")
shopButton:SetParent(Menu)
shopButton:SetText("")
shopButton:SetSize(100, 50)
shopButton:SetPos(0, 75)
shopButton.Paint = function()
--Color of entire button
surface.SetDrawColor(50, 50, 50, 255)
surface.DrawRect(0, 0, shopButton:GetWide(), shopButton:GetTall())
--Draw Bottom and Right borders
surface.SetDrawColor(40, 40, 40, 255)
surface.DrawRect(0, 49, shopButton:GetWide(), 1)
surface.DrawRect(99, 0, 1, shopButton:GetTall())
--Draw Text
draw.DrawText("Shop", "DermaDefaultBold", shopButton:GetWide() / 2, 17, Color(255, 255, 255, 255), 1)
end
shopButton.DoClick = function(shopButton)
local shopPanel = Menu:Add("ShopPanel")
end
end
--Player Panel
PANEL = {} -- Create an empty panel
function PANEL:Init() --Initialize the panel
self:SetSize(650, 475)
self:SetPos(100, 25)
end
function PANEL:Paint(w, h)
draw.RoundedBox(0, 0, 0, w, h, Color(0, 0, 0, 255))
end
vgui.Register("PlayerPanel", PANEL, "Panel")
--End Player Panel
--Shop Panel
PANEL = {} -- Create an empty panel
function PANEL:Init() --Initialize the panel
self:SetSize(650, 475)
self:SetPos(100, 25)
end
function PANEL:Paint(w, h)
draw.RoundedBox(0, 0, 0, w, h, Color(255, 255, 255, 255))
end
vgui.Register("ShopPanel", PANEL, "Panel")
--End Shop Panel
init.lua:
AddCSLuaFile( "shared.lua" )
AddCSLuaFile( "cl_init.lua" )
AddCSLuaFile( "testhud.lua" )
local open = false
include ( 'shared.lua' )
local open = false
function GM:PlayerInitialSpawn(ply)
if(ply:GetPData("playerLvl") == nil) then
ply:SetNWInt("playerLvl", 1)
else
ply:SetNWInt("playerLvl", ply:GetPData("playerLvl"))
end
if(ply:GetPData("playerExp") == nil) then
ply:SetNWInt("playerExp", 0)
else
ply:SetNWInt("playerExp", ply:GetPData("playerExp"))
end
if(ply:GetPData("playerMoney") == nil) then
ply:SetNWInt("playerMoney", 0)
else
ply:SetNWInt("playerMoney", ply:GetPData("playerMoney"))
end
end
function GM:OnNPCKilled(npc, attacker, inflictor)
attacker:SetNWInt("playerMoney", attacker:GetNWInt("playerMoney") + 100)
attacker:SetNWInt("playerExp", attacker:GetNWInt("playerExp") + 100)
checkForLevel(attacker)
end
function GM:PlayerDeath(victim, inflictor, attacker)
attacker:SetNWInt("playerMoney", attacker:GetNWInt("playerMoney") + 100)
attacker:SetNWInt("playerExp", attacker:GetNWInt("playerExp") + 100)
checkForLevel(attacker)
end
function GM:PlayerLoadout(ply)
ply:Give("m9k_l85")
ply:Give("m9k_colt1911")
ply:Give("m9k_knife")
ply:Give("m9k_m61_frag")
ply:GiveAmmo(500, "ar2", true)
ply:GiveAmmo(100, "pistol", true)
return true
end
function checkForLevel(ply)
local expToLevel = (ply:GetNWInt("playerLvl") * 100) * 2
local curExp = ply:GetNWInt("playerExp")
local curLvl = ply:GetNWInt("playerLvl")
if(curExp >= expToLevel) then
curExp = curExp - expToLevel
ply:SetNWInt("playerExp", curExp)
ply:SetNWInt("playerLvl", curLvl + 1)
end
end
function GM:PlayerDisconnected(ply)
ply:SetPData("playerExp", ply:GetNWInt("playerExp"))
ply:SetPData("playerLvl", ply:GetNWInt("playerLvl"))
ply:SetPData("playerMoney", ply:GetNWInt("playerMoney"))
end
function GM:ShutDown()
for k, v in pairs(player.GetAll()) do
v:SetPData("playerExp", v:GetNWInt("playerExp"))
v:SetPData("playerLvl", v:GetNWInt("playerLvl"))
v:SetPData("playerMoney", v:GetNWInt("playerMoney"))
end
end
function GM:ShowSpare2(ply)
ply:ConCommand("open_game_menu")
end
Thanks!
-Graham

Answer 1

You call
concommand.Add("open_game_menu", gameMenu())
which calls addButtons(Menu) which is nil at this point as the function definition follows after concommand.Add("open_game_menu", gameMenu()).
It's all there. You just have to read the error message.
Change the order in your script to fix the error.