error when starting l2.exe

"?GL2ShowCMViewer@@3HA cant be found from dynamicly linked libarary Core.dll.

this is what i get when i try to start l2.exe. i use clear core.dll from interlude (from clean system folder). i tried to change core.dll but then i get another error. i play on pirate server so is this administration fault? Should they upload anther core.dll in patch? r is this mine problem (some ppl have it problem too on my server.)