RetroaArch Playlist Manager: can you hlp me?

Hi i dowloaded Retroarch playlist manager in order to create the playlist of Sega Dreamcast games because they aren’t detected automatically.

But the games aren’t corectly detected i think: their icon are black block and if i run them, the emulator crashes, Retroarch closes… Can you tell me how can I correctly create a playlist with this software, please?

thank you very much!