So … that's not good.
Viewing post in Secrets of the Menhirs comments
The save function is a RPG Maker tool so I don't know where the problem comes from :l
I saw this in a forum, try to do what says the second comment: rpg maker forum
In which platform are you running the game? I guess is Mac bc the permissions error, just to know,
Sorry for the problem, tell me if the solution worked please, I don't have a Mac to make tests :(