Thanks for sharing your concern today, @Wallboard. 

There are various causes of Unrecoverable Errors and the codes that may come with it in QuickBooks. 

Before performing necessary troubleshooting, let's make sure to:

1. Update QuickBooks Desktop to the latest release.
2. Create a backup of your company file.

Then, let's identify how many users are affected as our initial steps. Here's how:

1. From the Company menu, select Set Up Users and Passwords > Set Up Users.
2. Enterprise users: Go to the Company menu, then select Users > Set Up Users and Roles.
3. Select Add User..., then type the user name and password. Select Next.
4. Note: Do not use the damaged user name.
5. Customize the user as necessary, then select Finish.
6. Go to the File menu, then select Close Company/Logoff.
7. Log in to the company file using the new log in the credential.

If the Admin user is damaged, run the QuickBooks File Doctor from the QuickBooks Tool Hub. This will help fix common errors. 

If the issue persists, I'd recommend following Solution 2 in this help article: Unrecoverable Error: General Troubleshooting Steps.

Feel free to keep in touch if you need additional help. We're always around here to assist.