[ydl-gen] Boot error

[angelo]

Hello everyone ! Some time ago, I had a blackout while YDL 6.2 was 
running. Since then, I get this message after starting udev: error at "! 
/etc/X11/Xmodmap". I'm running YDL on a PS3 40 GB, which I expanded to 
250 GB, European version, with GameOS 3.10.  After  giving this error, 
everything works fine.  Can anyone tell me what this message means and 
how to fix it ?
Keep in mind that I'm a newcomer to Linux, so please explain 
straightforward.
Any help will be appreciated. Thanks in advance, Angelo.