How to Fix QuickBooks Desktop Error C=387 (Runtime Error)?

QuickBooks Error C=387 is a runtime error that affects all QuickBooks Desktop versions, including Pro, Premier, Enterprise, and older editions. Data integrity issues, corruption in the company file, or problems during file backup, restoration, or migration often cause this error. It may also occur if there’s a conflict between QuickBooks and the Windows operating system or if QuickBooks encounters internal errors while performing specific operations like exporting data, generating reports, or reconciling accounts.

Below are 5 solutions to resolve QuickBooks Desktop Error C=387. Follow them carefully to fix the error and get QuickBooks working again.

Solution 1: Download QuickBooks Updates

The latest updates include feature improvements and bug fixes. To check for the latest QuickBooks updates:

1. Press F2 in QuickBooks to open the Product Information window.
2. Check the latest version and release of QuickBooks.

To manually update your QuickBooks application, follow these steps:

1. Open QuickBooks and go to the Help menu. Select Update QuickBooks Desktop.
2. Navigate to the Update Now tab and click Get Updates.
3. Close and reopen QuickBooks. When prompted, install the updates.
4. Follow the on-screen instructions to complete the installation.

Solution 2: Rename TLG/ND Files

ND and TLG files store network information for QuickBooks. If these files are corrupted, errors can occur. Rename them to fix the issue:

1. Open the folder with your QuickBooks company file.
2. Find files named YourFileName.qbw.nd and YourFileName.qbw.tlg.
3. Right-click each file, select Rename, and add .OLD at the end (e.g., YourFileName.qbw.nd.OLD).

Solution 3: Uninstall and Reinstall .NET Framework

QuickBooks Desktop Error C=387 may occur if the .NET Framework is missing or corrupted. Fix it by reinstalling:

1. Open Control Panel > Programs & Features.
2. Select Microsoft .NET Framework and click Uninstall.
3. Follow the prompts to remove it.
4. Restart your system.
5. Download and reinstall the .NET Framework.

Solution 4: Check and Fix the Template Issue

A damaged template in QuickBooks may cause error C=387. To fix it:

1. Go to Lists and select Templates.
2. Open each template one by one until the error appears.
3. Identify the error template and make necessary changes to resolve the issue.

Solution 5: Repair the Company File

Corruption in the company file can cause QuickBooks Desktop error C=387. Use the Verify and Rebuild tool to fix it:

1. Open QuickBooks and go to File > Utilities > Rebuild Data.
2. Follow the prompts to back up your company file.
3. Allow QuickBooks to rebuild the file.
4. Verify the file by selecting File > Utilities > Verify Data.
5. If no issues are found, the repair is complete.

What are the Prerequisites to Fix QuickBooks Desktop Error C=387

Below are the following prerequisites to avoid further complications and streamline the resolution process:

1. Backup Your Company File
2. Update QuickBooks Desktop
3. Verify system meets QuickBooks’ requirements.
4. Download QuickBooks Tool Hub
5. Ensure admin access and store files locally or on a stable network.
6. Temporarily turn off antivirus or firewall software.
7. Check network stability for multi-user mode.
8. Update your operating system.

How to Identify QuickBooks Desktop Error C=387?

You can identify QuickBooks Error C=387 through the following signs:

1. A runtime message states, “QuickBooks Error Code C=387 encountered.”
2. Problems opening, backing up, or restoring company files.
3. QuickBooks crashes, freezes, or stops responding during tasks 
4. Slow system performance 
5. Missing entries or discrepancies in reports or transactions.

How to Prevent QuickBooks Error C=387?

To prevent QuickBooks Error C=387, always do the following:

• Back-Up Files Regularly
• Update QuickBooks
• Use the Verify and Rebuild Data tools periodically.
• Use Stable Networks
• Prevent disruptions during backups and restores.
• Save company files on local, secure drives.
• Check System Requirements
• Temporarily Disable Antivirus

When Should You Seek Professional Help for QuickBooks Desktop Error C=387?

Seek professional help for QuickBooks Error C=387 if basic fixes like updates, data verification, or using File Doctor don’t work. If the error causes data loss or file corruption or affects key functions like backups and reports, it’s best to contact customer support to avoid further issues.