[Systems stopped working]

After trying to add a new system,  all of my other systems stopped working.  It says rom or files not found. 

[Launchbox won't load Naomi games]

I am hoping someone can help. When I am in Launchbox Naomi and I select a game it won't load. Only the Demul logo comes up.

If I go to the list of game in the naomi folder and click on them then the game loads. It just won't load from the pictures that show up in launchbox.