How troubleshoot QuickBooks error 6190 816?

QuickBooks Error 6190 816 occurs when two or more users try accessing the same company file in single-user mode. The error appears with the message that it cannot open the file. Errors 6190 and 816 occur in QuickBooks because the system rejects the changes. Another reason for this error is a discrepancy between the TLG and the company file.
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