> The selected game is missing one or more required ROM or CHD images
> And this is happening in the last MAME
> UMK 3 version 1.2
> What happened?
The ROM set that MAME expects was updated to include additional data that has recently been dumped off an arcade board. The ROM set that you have is now out-of-date, and as the message clearly states, is missing one or more required ROM or CHD images.
The MAME documentation on what ROM sets are, and why their contents sometimes change, is pretty well-written, feel free to have a glance at it, the information in it might help you: http://docs.mamedev.org/usingmame/aboutromsets.html