QuickBooks Error 6190 is a common company file error that usually appears when multiple users try to access a company file in single-user mode, or when the transaction log file doesn’t match the company file. This issue can stop you from opening your books and interrupt daily accounting tasks, but the good news is that it can be fixed with a few practical troubleshooting steps.

This rewritten guide explains the causes, symptoms, and step-by-step solutions to resolve Error 6190 in QuickBooks Desktop.

What Causes QuickBooks Error 6190?

Error 6190 generally occurs when QuickBooks cannot verify the company file connection. Some of the most common reasons include:

Another user logged in to the company file in Single-User Mode

Mismatch between the .TLG (transaction log) file and .QBW company file

Corrupted company file or network data file

Incorrect file permissions or hosting configuration

Incomplete or failed QuickBooks update

Understanding the cause helps choose the right fix quickly.

Signs You’re Experiencing Error 6190

You may notice:

QuickBooks fails to open the company file

A pop-up message showing Error Code 6190 and 816

Slow performance or freezing during file access

Multi-user access suddenly stops working

If you see these symptoms, follow the solutions below.

Solution 1: Ensure All Users Are Logged Out

Error 6190 often happens when someone opens the file in single-user mode.

Steps to fix:

Ask all users to close QuickBooks.

Restart every workstation connected to the company file.

Restart the server hosting the company file.

Open QuickBooks again and access the file.

This simple step fixes the issue in many cases.

Solution 2: Rename the .TLG and .ND Files

These files help QuickBooks track transactions and network connections. If damaged, they can trigger Error 6190.

Steps:

Go to the folder where the company file is stored.

Locate files with the same name as your company file but ending in:

.TLG

.ND

Right-click each file and select Rename

Add .OLD at the end (example: company.qbw.nd.old)

Open QuickBooks and try again.

QuickBooks will automatically recreate fresh files.

Solution 3: Run QuickBooks File Doctor Tool

The File Doctor tool repairs company file and network problems automatically.

Steps:

Download and install QuickBooks Tool Hub

Open Tool Hub and go to Company File Issues

Select Run QuickBooks File Doctor

Choose your company file and click Check Your File

Let the scan complete, then reopen QuickBooks.

Solution 4: Verify Single-User Mode

If another user is logged in with single-user mode enabled, you’ll get Error 6190.

Fix:

Open QuickBooks on the server.

Click File → Switch to Multi-User Mode

Save and close QuickBooks.

Reopen from a workstation.

Solution 5: Update QuickBooks Desktop

Outdated software can cause compatibility issues with company files.

Steps:

Open QuickBooks

Go to Help → Update QuickBooks Desktop

Click Update Now

Install updates and restart QuickBooks

Keeping the software updated reduces file errors.

Solution 6: Check Hosting Settings

Improper hosting configuration can prevent the file from opening.

Steps:

Open QuickBooks on the server computer

Go to File → Utilities

If you see Host Multi-User Access, click it

If you see Stop Hosting Multi-User Access, leave it as is

Repeat on all workstations — hosting should only be enabled on the server

Solution 7: Restore a Backup File

If the company file is corrupted, restoring a backup may be the fastest solution.

Steps:

Open QuickBooks

Click File → Open or Restore Company

Choose Restore a Backup Copy

Select the latest backup and restore it

Make sure to store the restored file in a safe location.

Preventing QuickBooks Error 6190 in the Future

To avoid encountering this error again:

Always close QuickBooks properly

Avoid switching off systems while QuickBooks is open

Keep backups updated daily

Use stable network connections

Update QuickBooks regularly

Store company files on a dedicated server

Preventive maintenance reduces downtime and data risks.

Final Thoughts

QuickBooks Error 6190 can seem frustrating, but it’s usually caused by simple file or access conflicts that can be resolved quickly. By ensuring users log out properly, repairing network files, updating QuickBooks, and verifying hosting settings, you can restore access to your company file without data loss.

If the problem continues even after trying all solutions, you may consider reaching out to certified QuickBooks professionals or contacting the official support team of Intuit for advanced troubleshooting.
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