When you encounter a save error, you can either start over or exchange the backup memory. A save error usually occurs when the game cannot load the saved state. It may happen when a save is stuck at flash 64k. Then you can’t load the save from the game’s save states page. To fix this issue, restart the game and then exchange the backup memory. You will need to reset the rom and then choose the interrupt and save options to get the game back.
How to Fix a Save Error in World of Warcraft