If you are running in this folder structure with "-retropath" then you will probably need to alter the path in "emulator.singe"
Open "emulator.singe" in a text editor, and find all the instance of "actionmax" in red below and change them to the name of one of the games i.e. "38ambushalley"
So after editing is would look like this for example:
spriteLoad("singe/actionmax/sprite_lighton.png") Before
spriteLoad("singe/38ambushalley/sprite_lighton.png") After
You also need to make the same change in:
38ambushalley.singe, bluethunder.singe, hydrosub2021.singe, popsghostly.singe and sonicfury.singe
dofile("singe/actionmax/emulator.singe") Before
dofile("singe/38ambushalley/emulator.singe") After
This is in the docs for a RetroPie style setup, although in the docs they use a Perl script to automate it.