The read me says:
Bomb Jack (set 2) bombjac2 bombjack
In MAME the file name is:
Bomb Jack (set 2)
bombjack2 bombjack
After you grab the correctly named ROM you must rename it (incorrectly) so that the EMU will recognize it. Perhaps you might consider updating the EMU to use the correct file name?
Regards,
-Another World