80040422 - This application requires Single User file access
80040422 - This application requires Single User file access mode and there is already another application sharing data with this QuickBooks company data file.
Resolving Error Code 80040422
Our products do not require single user file access and this error should not occur, however, we have seen it occur when QuickBooks is performing an automatic update and you are trying to access the QuickBooks file with our software.
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