Critical error

[tromparifas]

I get ths critical error when i try to open the game (both from rpgupdater and l2.exe) , anyone able to help ?

2011.4.16 19:33:15
OS : Windows XP 5.1 (Build: 2600)
CPU : GenuineIntel  Intel(R) Pentium(R) Dual  CPU  E2160  @ 1.80GHz @ 1802 MHz 2047MB RAM
Video : NVIDIA GeForce 8600 GT (6658)
PosCode : LS8(83) 0:0:0 2/0 [483]

Failed to enter Can't find MaskTexture in file 'MaskTexture BG_Effect_T.belis_dungeon_15_eff': (null)

History: UGameEngine::Init <- InitEngine

First time i try to connect to this server btw.