In spite of how good software is, every software has many errors. In Quickbooks, the error code 6190, 816 is among the most typical errors found.
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Error Code -6190, -816 is described as “QuickBooks was not able to open the file [path] on the host computer.” Which means that your company file just isn't accessible. This may due to a variety of reasons, including:

The Transaction log file is certainly not matching with all the company file. The Transaction log file is the summary of transactions carried out by the organization and it is automatically saved by QuickBooks. It is stored as [company file name] file. You can’t open it to transform this file into Company Data File . Hence, as soon as the file will not match along with its linked file, the QuickBooks Error Code 6190816. Another reason could be due to update failure. When a business file is updated on an unusual computer without updating its transaction file, it's going to show error -6190, -816.
Third reason for this error can be caused when another user is accessing the business files in Single User Mode.
The least possible cause for this error is Data Corruption into the QuickBooks data file. However it is important to identify the data corruption in QuickBooks.
How exactly to resolve QuickBooks Error code -619, -816: Before performing anything in your QuickBooks, make fully sure your QuickBooks software is updated utilizing the latest version. The outcomes will soon be displayed. It will automatically detect and repair the corrupted company file. In the event that error still persists, continue to next solution: Fix the mismatch: Make sure you're making use of the same computer on which you have saved the company file.