Thank you for this software. It works great to identify missing artwork. In a perfect world it would run on a raspberry pi too, but it was easy enough to; copy my roms folder over to a window PC, do the scanning in windows, and go back to my rPi to fix any issues the tool uncovered. Kudos.
Please do not post a support request without first reading and following the advice in https://retropie.org.uk/forum/topic/3/read-this-first