Need help getting DS roms to play on No$gba

I tried to run New Super Mario Bros, but am getting the message "Saved Data could not be read. Turn off the power and reinsert the game card." I've reset the game and the emulator to no avail. How can I get this running?

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

Thanks for the help, but I'm still not having any luck. Now I'm getting the message "Could not erase data. Turn the power off and reinsert the game card." I tried erasing the data manually, still can't get it to play. What can I do?

Try different backup media types, that's all you can really do. NDS Emulators aren't perfect yet, they emulate 2D somewhat well but 3D and sound is still bad, so if it doesn't work after trying all the save types then there's nothing you can do.