Error 6190 in QuickBooks Desktop occurs when multiple users try to access a single company file in multi-user mode, or when there’s a discrepancy between the company file and transaction log file. Here are the possible causes and solutions:

• Multi-user mode issue: When one or more users are running QuickBooks Desktop in Multi-User Mode on the network, and only the server computer should have this mode enabled.
• Solution: Ensure only the server computer has Multi-User Mode enabled. Switch other users to Single User Mode.
• Company file and transaction log file mismatch: The transaction log (.TLG) file doesn’t match the company data file (.QBW) file.
• Solution: Rename the ND and TLG files to repair damaged data.
• Improper software installation: Installation issues can cause errors like 6190.
• Solution: Ensure QuickBooks is installed correctly and up-to-date.
• Corrupted company file: The company file may be damaged, leading to error 6190.
• Solution: Try to open the company file in Single User Mode. If the issue persists, consider restoring a backup or seeking expert help.
• Malware or viruses: Ransomware, malware, or viruses can interrupt QuickBooks functionality.
• Solution: Remove any unwanted applications and run a virus scan to ensure your system is secure.

Additional Tips

• If you’ve already tried the usual steps to fix error 6190 and haven’t had success, consider seeking expert help from QuickBooks Data Services Experts (1-855-550-0054).
• Regularly back up your company file to prevent data loss in case of errors or corruption.
• Ensure your QuickBooks installation is up-to-date to minimize the risk of errors like 6190.