Here is my emulator settings:
executable /opt/retropie/supplementary/runcommand/runcommand.sh
args 0 _SYS_ mame2003 "[romfilename]"
rompath /home/pi/RetroPie/roms/mame-libretro
romext .zip;.ZIP
system Multiple Arcade Machine Emulator
import_extras /home/pi/RetroPie/roms/mame-libretro/cav/Catver.ini
artwork flyer /home/pi/RetroPie/roms/mame-libretro/flyer
artwork marquee /home/pi/RetroPie/roms/mame-libretro/marquee
artwork snap /home/pi/RetroPie/roms/mame-libretro/snap
artwork wheel /home/pi/RetroPie/roms/mame-libretro/wheel
When I try to run a Rom it comes back
No config found for system mame2003