How to Fix QuickBooks Error code 6190 and 816?

QuickBooks error code 6190 and 816 belongs to the QuickBooks 6000 error series. This particular error is seen when multiple users try to open the company file in single user mode. Such an error is also seen if there is a discrepancy between the transaction file and the company file. Moreover, the system is not able to accept which lead to QuickBooks error 6190 and 816.