The QuickBooks Unrecoverable Error XXXXX XXXX signifies that QuickBooks unexpectedly closed. When you: Open or close a file, you might notice this. Keep a copy (backup or portable copy). If a user is logged into the QB business file, a network snag can be the root cause of this problem. Alternatively, this problem can be brought on by Windows or QuickBooks not having the latest upgrades. Data integrity issues with the QB Company file may also be the cause of this error
