Critical error

hello,
i keep getting a critical error. i don't know what to do. any suggestions?

2012.6.30 0152
l2build110830
os : windows7(32) 6.1 (build: 7601)
cpu : genuineintel intel(r) core(tm) i7 cpu 860 @ 2.80ghz @ 2801 mhz 4086mb ram
video : nvidia geforce gtx 260 (9610)
poscode : ls9(411) 111455:219400:-3546 8/1 [535]

idirect3dvertexbuffer9::lock failed(88760870).

history: fd3dvertexstream::cache <- rendev=fd810000 <- caching <- size check: 150784, 150784 cache id: 497347041, 0 <- fd3drenderinterface::setvertexstreams <- rendev = fd810000 40874389 1077 28106593 1096 11199000 296 1568796 <- uskeletalmeshinstance::drawsection <- pawn=transient.heroes_obelisk_human meshinstance=lineagenpcs.skeletalmeshinstance meshname=lineagenpcs.heroes_obelisk_human_m00 bodypart=-1 <- uskeletalmeshinstance::render <- umeshcomponent::render <- umeshcontainer::render <- rendertranslucentactortoproxy <- fdynamicactor::renderstencilalphaactor <- fdynamicactor::render <- heroes_obelisk_human <- renderactor <- actor <- translucentrendering <- renderlevel <- flevelscenenode::render <- fplayerscenenode::render <- scenenoderender <- draw <- ugameengine::draw <- grendev = fd810000 <- uwindowsviewport::repaint <- uwindowsclient::tick <- clienttick <- ugameengine::tick <- updateworld <- mainloop

 

hello,
please check your client with this tool

if this dont help please let us know.

best regards