Tell us about yourself!
Your error message is stating that you have too many subdirectories under your advmame roms folder. Not sure why you have so many /hi/ folders, but removing those folders will stop the error message.
For anyone having the same issue. I noticed that the instructions say to put the red wire on pin 19, but the correct pin is pin 21. Looking at the images for the project you can see where the wire should be.