Failed to read a required file. Please close all other applications, temporarily deactivate your antivirus software, and try again.
Troubleshooting steps for the Battle.net desktop app getting stuck on Starting...
Information about this error when adding a phone number or a Battle.net Authenticator to a Battle.net account.
Error emerges when trying to restore the previous authenticator on a new device
How to remove your Blizzard Authenticator
Performing a scan of your computer's physical memory can help identify possible errors.
How to resolve this error when redeeming a Battle.net Balance code