Could not read the data

I recently was trying out NDS roms, I am using the No$gba emulator, and whenever I try to play any rom I get a message that says "Could not read the data. Please turn off the power, and reinsert the DS card."

What version of no$gba are you using?

https://www.romulation.org/forum/index.php/topic,1462.0.html

thanks