Help PAC3 how ?

Hi i need help how to convert mdl files or smd files to obj i appreciate tutorial thanks :]
when i try enter the model its say

[ERROR] lua/includes/extensions/table.lua:161: bad argument #1 to ‘pairs’ (table expected, got nil)

  1. pairs - [C]:-1
  2. Count - lua/includes/extensions/table.lua:161
    3. callback - addons/pac3/lua/pac3/core/client/parts/model.lua:426
    4. onsuccess - addons/pac3/lua/pac3/core/client/libraries/urlobj.lua:185
    5. unknown - lua/includes/modules/http.lua:34

wtf?