QuickBooks Error 6190 816 happens once multiple users try and open the corporate file into single-user mode. This error can even happen if there's a discrepancy between the corporate file and the transaction file. We hope this article can assist you to resolve the QuickBooks error 6190 816. If the above-shown procedures don’t resolve your problems, at once get in contact with our eBetterBooks Support at +1-844-929-2244 for technical assistance.