@sticcino I am picking up a couple things from your message. First, most of us keep the roms zipped. There are no folders used, just a single folder filled with zip files, and the actual ROM chip files are zipped up inside them. That said, I think MAME can work with them unzipped in folders of the same names, but maybe not FBA.
Second, MAME is able to look at multiple zips to load dependencies. In other words, the necessary files can be in other zip files (or other folders, if your ROMs are not zipped), but as you say, 19xx has no parent ROM.
Assuming you are using the correct romset for the emulator you are launching, it sounds like you might have a permissions problem, either with the folder, or the files themselves. Where exactly is this "clean" folder you are using, and what emulator are you using?