chmod doesnt work if your are in the MyDocs folder (or inside of a folder inside of MyDocs) because its fat32. Move the gba folder to /home/user and it'll chmod just fine.

I did get the program to run. It displays a simple blue selection screen. I navigated to my roms folder and tried several different gba roms but they all crashed the emulator. Not quite yet ready for prime time but I look forward to future releases.