Quickbooks error 6190, 816 is defined as the error that stops you from opening the company file and this often happens when Quickbooks file is no longer accessible. Quickbooks error 6190, 816 pops up with the message reading as “Error 6190 816 : Quickbooks is unable to open the company file”. It happens when some other user is logged in to the company file and the system is enabled in single user mode.

Reasons for QuickBooks Error 6190,816?
The company file may not match with the transaction log file.
Quickbooks update failed.
Single user mode is activated.
The Quickbooks data may be corrupted.

How to resolve QuickBooks Error 6190,816?
Solution 1: Update the Quickbook.
To begin, close all Quickbooks related windows.
Go to the start window, open Quickbooks.
Right-click the Quickbooks desktop.
Choose to run as an admin option.
You will notice the no company open window.
Go to the help menu.
Go to the update Quickbooks option.

Solution 2: Rename tlg and nd file to fix Quickbooks error 6190, 816:
To commence with, open the company folder.
Locate the files ending with .nd and .tlg extensions.
You must continue to rename these files.

Solution 3: Check for single user mode.
To begin with, all the Quickbooks users need to log out.
Next, restart the computer.
Moving ahead, copy the data file.
You might copy this to the desktop.
Following next, copy this data file back to its source location.
Login to Quickbooks.

Perhaps the methods we discussed above were of help in fixing Quickbooks errors 6190, 816.. If you are still experiencing Quickbooks error 6190, 816, reach out to QBSsolved at 888-910-1619.

https://www.qbssolved.com/way-to-fix-quickbooks-error-6190-816/