Please be kind as I am very new to front ends.

I am using Mala 1.0 rev8 with Mame 0.111. All tested games work fine in Mame alone, but when I try and select them in Mala, I get files missing errors and back to the game list. I have only done the basic configuratioins of selecting the directories and mame exe, etc. What could be causing this to happen?
Thanks in advance.
Vassago