Hi,
So i suppose you tried to make your own config and didn't use a Plug'n play module?

If you downloaded plug'n play module, in a first time you have to disable them to do your confg. (use plugnplaymanager.exe to disable modules)

Then run AtomicManager.exe

Go on the "folder" tab.

Specify roms folder as : c:\roms
Specify default emulator as : c:\mame\advmame.exe

Save your config file , and click on "Set up as Start config" button.

Then exit AtomicManager and run Atomic.exe

It should work.

If it does work. Check your folder again, and check if you didn't misstyped emulator name.

Then check , if your roms are directly in the c:\roms folder (not in a subdirectory).

Where do you see exactly the message? What is the exact message? what version of advancemame you use?

Usually if you run advancemame from a command line what do you type?

(ex, if you want run pacman , do you type something like :
c:\mame\advancemame.exe pacman.zip
or c:\mame\advancemame.exe c:\roms\pacman.zip
or c:\mame\advancemame.exe pacman
or..etc...
)

Give these information, and i will give you the solution .. some mame version have specificity , mainly old one and dos one....

thanks