Problem kronos and stv games

Hi guys I have a problem with the Kronos core and stv games. I insert the bios (checked) in the system folder and the roms in the usual folder but when I start a game for example cotton boomerang nothing happens. I downloaded the bios and roms from a site where they were tested and they worked for people but not for me. Where I’m wrong, sorry for the English, I use a translator

If you are testing ST-V in Kronos, both the bios and the roms have to be obtained from the latest updated MAME set, because, they may not work if they are outdated.

I tried it and it gave me error, maybe it’s a major bug, I recommend you to make a log and create a bug report on their github. https://github.com/FCare/Kronos/issues