i want anyone tell me how i Disband this problem Couldn't load sof2mp_default.cfg :  :  :  :

Try reinstalling the game

What are you trying to do? running a server? or just the game?
anw download and replace this file into your  (C:\Program Files (x86)\Soldier of Fortune II - Double Helix\base) folder it should work again

http://www.youngandoldboys.com/mp.pk3