When you create an Accountant's Copy (.QBX) or converting an Accountant's Copy to an Accountant's Copy Working file (.QBA), you get the error, "Failed" or "QuickBooks has detected an error with your installation. Please Reinstall QuickBooks," with a big red "X" or ✕ .
What you should do:
Solution 1: Copy your file on your Desktop.
Solution 2: Create a QuickBooks portable company file
Solution 3: Resolve data damage on your company file