Hash mismatch detected. Why and How to fix it?
On iMac Monterey 12.7.4 Hash mismatch detected on volume disk2s5. What does this mean?
iMac, OS X 10.11
I doubt that it is MainStage related. However, you could go to Disk Utility and run an error check (First Aid) and see if that throws up any clues.
If you go to the Command prompt and enter without quotes "diskutil list", you will see which disk name pertains to the disk disk2s5.