need help with ant nation and my dangerous pet snake

ok so i have download both of this game and when i try to play them on my no gba 2.6a its says unable to write save game. turn power off and reinsert game card for the snake 1 and for the ant nation its says data could not be written please turn the power off and reinsert the ds card both games are by bahumnt

https://www.romulation.org/forum/index.php?topic=1462.0Make sure you are using No$GBA 2.6a (Help -> About), and the NDS Backup type is set to Auto.

ty so much