QuickBooks error code 6190 and 816 appears when the user tries to login to QuickBooks, 

Causes of occurrence of QuickBooks error code 6190 and 816:

.QBW file might have been updated in another computer. 

Two users accessing the same file in single user mode. 

To fix QuickBooks error code 6190 and 816, you can download and run QuickBooks tool hub. 

This tool will repair all the errors occurring in QuickBooks company file. 

Hope QuickBooks error code 6190 and 816 is now sorted. For more help, feel free to connect to QBSsolved at +1(888) 910 1619. 

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To fix QuickBooks Error 6190 and 816, you can try the following steps:

Restart your computer and QuickBooks. This can sometimes resolve minor software glitches that can cause QuickBooks errors.
Check your internet connection. Make sure that your computer is connected to the internet and that you have a strong signal.
Update QuickBooks. Make sure that you have the latest version of QuickBooks installed. You can download the latest version of QuickBooks from the Intuit website.
Repair QuickBooks. You can use the QuickBooks Tool Hub to repair your QuickBooks installation. To do this, open the QuickBooks Tool Hub and select Installation Issues > Repair QuickBooks.
Run QuickBooks in single-user mode. To do this, go to File > Utilities > Open Company File in Single-user Mode.
Rename the QuickBooks .ND and .TLG files. To do this, close QuickBooks and go to the folder where your company file is saved. Rename the .ND and .TLG files to something else. Then, open QuickBooks and try to open your company file again.

Greetings,
Peter