Cant load roms in nividia shield

[nudds]

hello.After days and days of watching tutorials  and reading your forums iv finaly got hyperspin working on my laptop.Iv learned how to change my intro video, add video content and  how to add my wheel art and update box art ext.Iv also updated my database.xml file in rocket launcher ui and all my roms are green as matched.Iv got the mega drive, master system ,64,nes and snes working on pc fine. It looks fantastic at the moment and just need to learn a few more things like adding a theam,controllers or bezzles but im sure i could find a tutorial on them issus. The big problem im having now is i cant get the roms to load on  nividia shield.I can get it to load up with all the fancy art and videos and stuff but when i try to load the games it says warning-attempted to launch missing rom.Iv spend hours and hours looking for the correct answer online but i cant find it. I feel like i have come so far and im so close to understanding it all and getting it working on my shield like i first set out to do 2 years ago lol.Please help.Thank you