When opening the company file, QuickBooks encountered error 6190-816. Error Codes -6190 and 816 typically occur when a single-user user is logged into the company file. Errors like this are common in the QuickBooks program. Unwanted errors can occasionally be frustrating. These errors can have an effect on the QuickBooks software's functionality and company files. Don't worry if QuickBooks error code 6190 recently affected your software. We are available to help you!