How to Fix QB Error Code 6190 and 816

QB Error Code 6190 and 816 occurs when QB cannot access the company file due to file mismatches, single-user mode conflicts, or network issues. This error typically prevents users from opening or modifying their company files, which can disrupt accounting tasks.

If you're facing this error, don't worry! This guide will provide step-by-step solutions to fix QB Error 6190 and 816 quickly.

Causes of QB Error 6190 and 816

This error can occur due to multiple reasons, including:

Mismatch between .QBW and .TLG files: When the company file (.QBW) and transaction log file (.TLG) don’t match, QB may display this error.
Another user is accessing the company file in single-user mode: If another user is logged in and trying to access the file in single-user mode, it can create a conflict.
Data corruption in QB company file: If the company file is corrupted, QB may fail to open it.
Incomplete QB update: If an update was interrupted, some QB files may not be properly installed.
Issues with QB multi-user mode: Network issues or improper setup of QB Database Server Manager can also cause this error.

Before fixing the error, follow some precautionary steps.

Precautionary Steps Before Troubleshooting

✔ Backup your QB company file to prevent data loss.
✔ Ensure QB is updated to the latest version.
✔ Restart your computer and QB to clear temporary glitches.

Now, let’s go through the different solutions.

Methods to Fix QB Error 6190 and 816

Method 1: Use QB File Doctor

QB File Doctor is a tool provided by Intuit to fix company file errors.

Steps to use QB File Doctor:

Download QB Tool Hub from the official Intuit website.
Open the Tool Hub and select Company File Issues.
Click on Run QB File Doctor.
Select your company file and Run the scan.
Restart QB and check if the error is resolved.

Method 2: Rename .ND and .TLG Files

Network Data (.ND) and Transaction Log (.TLG) files store QB settings. Renaming them forces QB to create fresh copies.

Steps:

Open the folder where your QB company file is stored.
Locate the files with the same name as your company file but ending in .ND and .TLG (e.g., CompanyFile.qbw.ND and CompanyFile.qbw.TLG).
Right-click each file and select Rename.
Add .OLD at the end (e.g., CompanyFile.qbw.ND.OLD).
Restart QB and try accessing the company file again.

Method 3: Check for Single-User Mode Conflict

If another user is accessing the company file in single-user mode, you may get this error.

Steps:

Ask all users to log out of QB .
Restart the host computer (where the company file is stored).
Open QB and switch to multi-user mode:
- Go to File > Switch to Multi-User Mode.
Try opening the company file again.

Method 4: Verify and Rebuild Data in QB

The Verify and Rebuild tool checks and fixes QB file errors.

Steps:

Open QB and go to File > Utilities > Verify Data.
If an issue is found, go to File > Utilities > Rebuild Data.
Follow the on-screen instructions and let QB repair the file.
Restart QB and check if the error persists.

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Method 5: Use QB Database Server Manager

If QB is in multi-user mode, using QB Database Server Manager can resolve network issues.

Steps:

Open QB Tool Hub and go to Network Issues.
Click on QB Database Server Manager.
Scan the company file folder and restart QB .

Method 6: Restore a Backup File

If your company file is corrupt, restoring a backup may be the best solution.

Steps:

Open QB and go to File > Open or Restore Company.
Select Restore a backup copy and click Next.
Choose Local Backup and locate your backup file.
Restore it to a different location and try opening it.

Method 7: Check for Software Conflicts

Antivirus or firewall settings can block QB from accessing the company file.

Steps:

Temporarily disable antivirus/firewall software.
Try opening QB again.
If the issue is resolved, add QB as an exception in your security settings.

Preventive Measures to Avoid QB Error 6190 and 816

Keep QB updated to avoid compatibility issues.
Ensure stable internet and network connections for multi-user mode.
Avoid having multiple users accessing QB in single-user mode.
Regularly backup QB files to prevent data loss.

Conclusion

QB Error 6190 and 816 is a common issue caused by file mismatches, user conflicts, or corruption. By following the step-by-step solutions above, you can quickly resolve this error and keep QB running smoothly.

FAQs

What is the main cause of QB Error 6190 and 816?
- A mismatch between .QBW and .TLG files or a single-user mode conflict.
Can I fix this error without technical help?
- Yes! Follow the steps in this guide.
Does renaming .ND and .TLG files affect my data?
- No, it only resets QB network settings.
How do I switch from single-user to multi-user mode in QB ?
- Go to File > Switch to Multi-User Mode.
Where can I contact QB support?
- Visit Intuit’s official support page.

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