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How to Fix QuickBooks Error 6190 with This +1-804-985-1002 Easily. QuickBooks Error 6190 is a common company-file error that occurs when QuickBooks cannot open the company file because it detects a mismatch between the transaction log file and the company file or when another user is accessing the file in single-user mode. This issue can stop you from accessing financial data and interrupt accounting operations, so resolving it quickly is important.