'gnome-session' received an X Window System error'

["Mohinda Rao Raavi (Broetje)" <>]

Bonobo accessibility support initialized
GTK Accessibility Module initialized
Atk Accessibilty bridge initialized
_IceTransmkdir: Owner of /tmp/.ICE-unix should be set to root
SESSION_MANAGER=local/denver:/tmp/.ICE-unix/29734
The program 'gnome-session' received an X Window System error.
This probably reflects a bug in the program.
The error was '168'.
  (Details: serial 111 error_code 168 request_code 152 minor_code 8)
  (Note to programmers: normally, X errors are reported asynchronously;
   that is, you will receive the error a while after causing it.
   To debug your program, run it with the --sync command line
   option to change this behavior. You can then get a meaningful
   backtrace from your debugger if you break on the gdk_x_error() function.)
application finalize called

** (gnome-session:29734): WARNING **: FIXME: Need to shutdown linc connections 
...

** (gnome-session:29734): WARNING **: CORBA_ORB_destroy: ORB still has 3 refs.

** (gnome-session:29734): WARNING **: ORB: a total of 31 refs to ORB objects 
were leaked

Can any body know why this happens.

gnome build through garnome, was absolutely fine. After, everything went fine 
when I started the gnome-session it crashes and puts the error message like 
above.

Help me.....

Regards,