Im guessing you mean it shows the A.V.A splash screen then immediately closes.
This error occurs when the XIGNCODE.US files have been messed around with. The best way to fix this error is to download the new,full log files for that folder. Then delete all the current log files. Then restart the game it should work. *Note* Messing with log files and game files will result in a ban if used for hacking related stuff.
In the future DO NOT mess with the files. If so you are risking it yourself.
Need the log files and more help? PM me or add my Skype- avaisbest .
Thank You! Hopefully I resolved your error.