"Fail to save" in Pokemon X

“Fail to save” in Pokemon X
I ran into this trouble while using Mac. Starting from some point I could never save normally again.
I then transferred my “main” file to my friend’s windows computer, and he had no trouble saving on his computer.
How do I fix this problem on Mac?

System Information

Diagnostic Log
Upload your log file as an attachment by dragging & dropping.
citra_log.txt (6.0 KB)

In order to save a copy of the log, follow this guide:

No game was booted in your log. If you are experiencing a crash then do not open citra again until after you posted the log as it gets purged when you reopen citra.
For more information, see How to Upload the Log File

What does that mean? Do I need to upload my log again?

No, you don’t need to. As stated in the massive orange banner on our Downloads page, M1 MacOS devices are not supported.