I can't save!!

Hi friends,i wanna ask you something:I can't save the game in some roms,like naruto path of the ninja and others.When I try to save the game,it freeze and an iscription says:"the data could not be accessed.please turn off the power and reinsert the game card"why I can't save?

Read the Common Issues thread:
https://www.romulation.org/forum/index.php?topic=1462.0

ok I've just read it.I'll try with that guide thank you