LUA ERROR

Hi i’m doing my server right now and and doing my HUD DarkRP.
Anybody can help me with that problem ??

[ERROR] lua/includes/modules/draw.lua:86: bad argument #1 to ‘GetTextSize’ (string expected, got nil)

  1. GetTextSize - [C]:-1
  2. SimpleText - lua/includes/modules/draw.lua:86
  3. DrawHUD - gamemodes/darkrp/gamemode/client/hud.lua:231
  4. unknown - gamemodes/darkrp/gamemode/client/hud.lua:346

Post the code.