Ensure you are using the correct neogeo.zip and cps2.zip specifically labeled for the 0.238 revision .
Knowing how to place these files is just as important as having them. MAME is notoriously strict about how it structures its files, and it does not allow for deep folder navigation for system files. mame 0238 bios pack top
Are you setting up a that is currently giving you an error? Ensure you are using the correct neogeo