If you received QuickBooks error 6190 83 while accessing the company file, it indicates there are some network issues, or the same file is open on another computer in a single user mode. With the encounter of this company file, you will get an error message saying, "QuickBooks is unable to open this company file. It may have been opened by another user." There are several other causes behind the error, such as outdated QuickBooks desktop and dama...