For what it's worth, a disk I/O error is a general, unspecified problem with Zotero's ability to access your disk. If you have your Zotero data directory on a network drive or external disk, you should move it back to the local disk to avoid these kinds of problems.
If your data directory is already on a local disk, there may be an actual problem with your disk, and you should check it for errors.
Upgrade Storage
If your data directory is already on a local disk, there may be an actual problem with your disk, and you should check it for errors.