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Steps to Resolve QuickBooks Error 6190 and 816
It is quite easy to resolve the QuickBooks error 6190 and 816 without much hassle.

Step 1: Use the QuickBooks File Doctor Tool
The first thing that you must do is update your QuickBooks and install QuickBooks File Doctor Tool. Then follow the steps mentioned below.

Run the Tool.
In case you are not logged in as the administrator, it will ask you to do so.
Two options will be viewed on the screen: Network Connectivity Only and Both File Damage and Network Connectivity.
You must select the first option as that will detect all the corrupted and damaged files and will fix the QuickBooks error 6190.
Next, when it asks for a password, enter your Admin password.
Then it will ask whether the file is on Workstation or Server. You should choose accordingly and then click on Proceed.
Step 2: Fix the Discrepancy
In the usual scheme of things, it will automatically detect the damaged files and repair the corruption. If QuickBooks error -6190 -816 still remains, you can continue with Fix the Mismatch. It is imperative that you use the same computer in which you have saved the company file. Rename the files, it will cause no data loss and then follow these steps.

Open the Company folder and find the company file.
Right-click on the company file and select the rename option.
Similarly, rename the Transaction Log File.
Exit the system and then open QuickBooks and login in to the company file.
Step 3: Single User Mode Check
In a scenario that you are still facing QB error 6190 816, continue with Single User Mode Check.

After making sure all users are logged out, restart the computer.
Copy data file on the desktop (or any place beside the source) and then again back to its original location.
Sign in to QuickBooks.