I got the error right after installing the english patch ! So i backed up both "lang" and "lang0" files and after that i deleted them from the "pack" folder ! The error is gone , and i can enter the game ... too bad is al chinese !
Edit : i put the two files back in the "pack" file , update with english patcher , and tried again . It still works , dont know if english patch works thought , because i didnt go past character creation screen ! Got to go !
I had the same problem i fixed it by downloading the 1.51.44 patch again you have to click the red marked button and it will download and install again after that do the english patch again and you should be good