There Was An Unhandled Exception Trying To Save Your Rom To Disk -

Rare but possible: bad sectors on a hard drive, or a file system that needs checking ( chkdsk on Windows, fsck on Linux/macOS).

Extremely rare, but if your OS has deep-seated file permission corruption or user profile damage, a fresh install may be the only solution. Try creating a new Windows/macOS user account first – if the error disappears in the new account, your original profile is corrupted. Rare but possible: bad sectors on a hard