Users encounter QuickBooks error 6123 0 while modifying, upgrading, or restoring their company file. Luckily this issue is not so complex to resolve as it seems. There are numerous ways to fix the issue, some of them are-
Step 1: Download and install the QuickBooks Tools Hub
Step 2: Run QuickFix my Program
Step 3: Run File Doctor
Another possible attempt to fix the issue could be,
Restoring company file directly from the hard drive if the Error -6123,0 arises while restoring your company file (.qbw). Hope this helps in fixing your problem.