What are once.js Error Messages?

General once.js Runtime Errors

once.js file errors often occur during the startup phase of Facebook Desktop Messenger, but can also occur while the program is running. These types JS errors are also known as “runtime errors” because they occur while Facebook Desktop Messenger is running. Here are some of the most common once.js runtime errors:

• once.js could not be found.
• once.js error.
• once.js failed to load.
• Error loading once.js.
• Failed to register once.js / Cannot register once.js.
• Runtime Error - once.js.
• The file once.js is missing or corrupt.

Most JS errors are due to missing or corrupt files. Your once.js file could be missing due to accidental deletion, uninstalled as a shared file of another program (shared with Facebook Desktop Messenger), or deleted by a malware infection. Furthermore, once.js file corruption could be caused from a power outage when loading Facebook Desktop Messenger, system crash while loading or saving once.js, bad sectors on your storage media (usually your primary hard drive), or malware infection. Thus, it’s critical to make sure your anti-virus is kept up-to-date and scanning regularly.

How to Fix once.js Errors in 3 Steps (Time to complete: ~5-15 minutes)

If you're encountering one of the error messages above, follow these troubleshooting steps to resolve your once.js issue. These troubleshooting steps are listed in the recommended order of execution.

To begin System Restore (Windows XP, Vista, 7, 8, and 10):

1. Hit the Windows Start button
2. When you see the search box, type "System Restore" and press "ENTER".
3. In the search results, find and click System Restore.
4. Please enter the administrator password (if applicable / prompted).
5. Follow the steps in the System Restore Wizard to choose a relevant restore point.
6. Restore your computer to that backup image.

If the Step 1 fails to resolve the once.js error, please proceed to the Step 2 below.

You can uninstall Facebook Desktop Messenger software by following these instructions (Windows XP, Vista, 7, 8, and 10):

1. Hit the Windows Start button
2. In the search box, type "Uninstall" and press "ENTER".
3. In the search results, find and click "Add or Remove Programs"
4. Find the entry for Facebook Desktop Messenger 1.0.1 and click "Uninstall"
5. Follow the prompts for uninstallation.

After the software has been fully uninstalled, restart your PC and reinstall Facebook Desktop Messenger software.

If this Step 2 fails as well, please proceed to the Step 3 below.

Facebook Desktop Messenger 1.0.1

Netlabs.BG

When the first two steps haven't solved your issue, it might be a good idea to run Windows Update. Many once.js error messages that are encountered can be contributed to an outdated Windows Operating System. To run Windows Update, please follow these easy steps:

1. Hit the Windows Start button
2. In the search box, type "Update" and press "ENTER".
3. In the Windows Update dialog box, click "Check for Updates" (or similar button depending on your Windows version)
4. If updates are available for download, click "Install Updates".
5. After the update is completed, restart your PC.

If Windows Update failed to resolve the once.js error message, please proceed to next step. Please note that this final step is recommended for advanced PC users only.

If Those Steps Fail: Download and Replace Your once.js File (Caution: Advanced)

If none of the previous three troubleshooting steps have resolved your issue, you can try a more aggressive approach (Note: Not recommended for amateur PC users) by downloading and replacing your appropriate once.js file version. We maintain a comprehensive database of 100% malware-free once.js files for every applicable version of Facebook Desktop Messenger. Please follow the steps below to download and properly replace you file:

1. Locate your Windows operating system version in the list of below "Download once.js Files".
2. Click the appropriate "Download Now" button and download your Windows file version.
3. Copy this file to the appropriate Facebook Desktop Messenger folder location:
   
   Windows 10: C:\Users\Tester\AppData\Local\Temp\nw5512_26642\node_modules\node-webkit-updater\node_modules\del\node_modules\globby\node_modules\glob\node_modules\once\test\
   Windows 10: C:\Users\Tester\AppData\Local\Temp\nw5512_26642\node_modules\node-webkit-updater\node_modules\del\node_modules\rimraf\node_modules\glob\node_modules\once\test\
   Windows 10: C:\Users\Tester\AppData\Local\Temp\nw5512_26642\node_modules\node-webkit-updater\node_modules\tar.gz\node_modules\fstream\node_modules\rimraf\node_modules\glob\node_modules\once\test\
   Windows 10: C:\Users\Tester\AppData\Local\Temp\nw5512_26642\node_modules\node-webkit-updater\node_modules\del\node_modules\globby\node_modules\glob\node_modules\once\
   Windows 10: C:\Users\Tester\AppData\Local\Temp\nw5512_26642\node_modules\node-webkit-updater\node_modules\del\node_modules\rimraf\node_modules\glob\node_modules\once\
   Show 35 more directories +

   Windows 10: C:\Users\Tester\AppData\Local\Temp\nw5512_26642\node_modules\node-webkit-updater\node_modules\tar.gz\node_modules\fstream\node_modules\rimraf\node_modules\glob\node_modules\once\
   Windows 10: C:\Program Files (x86)\Adobe\Adobe Creative Cloud Experience\js\node_modules\request\node_modules\async\internal\
   Windows 10: C:\Program Files (x86)\Adobe\Adobe Creative Cloud Experience\js\node_modules\once\
   Windows 10: C:\Program Files (x86)\Adobe\Adobe Creative Cloud Experience\js\node_modules\lodash\
   Windows 10: C:\Program Files (x86)\Adobe\Adobe Creative Cloud Experience\js\node_modules\request\node_modules\lodash\
   Windows 10: C:\Program Files (x86)\Adobe\Adobe Creative Cloud Experience\js\node_modules\lodash\fp\
   Windows 10: C:\Program Files (x86)\Adobe\Adobe Creative Cloud Experience\js\node_modules\request\node_modules\lodash\fp\
   Windows 10: C:\Program Files (x86)\Adobe\Adobe Creative Cloud Experience\js\node_modules\request\node_modules\async\internal\
   Windows 10: C:\Program Files (x86)\Adobe\Adobe Creative Cloud Experience\js\node_modules\once\
   Windows 10: C:\Program Files (x86)\Adobe\Adobe Creative Cloud Experience\js\node_modules\lodash\
   Windows 10: C:\Program Files (x86)\Adobe\Adobe Creative Cloud Experience\js\node_modules\request\node_modules\lodash\
   Windows 10: C:\Program Files (x86)\Adobe\Adobe Creative Cloud Experience\js\node_modules\lodash\fp\
   Windows 10: C:\Program Files (x86)\Adobe\Adobe Creative Cloud Experience\js\node_modules\request\node_modules\lodash\fp\
   Windows 10: C:\Program Files\Common Files\Adobe\Creative Cloud Libraries\js\node_modules\once\
   Windows 10: C:\Program Files\Common Files\Adobe\Creative Cloud Libraries\js\node_modules\lodash\
   Windows 10: C:\Program Files\Common Files\Adobe\Creative Cloud Libraries\js\node_modules\lodash\fp\
   Windows 10: C:\Program Files (x86)\Common Files\Adobe\Creative Cloud Libraries\js\node_modules\once\
   Windows 10: C:\Program Files (x86)\Common Files\Adobe\Creative Cloud Libraries\js\node_modules\lodash\
   Windows 10: C:\Program Files (x86)\Common Files\Adobe\Creative Cloud Libraries\js\node_modules\lodash\fp\
   Windows 10: C:\Program Files\ALLPlayer\ALLTorrent\peerflix\node_modules\pump\node_modules\once\test\
   Windows 10: C:\Program Files\ALLPlayer\ALLTorrent\peerflix\node_modules\pump\node_modules\once\
   Windows 10: C:\Program Files\ALLPlayer\ALLTorrent\peerflix\node_modules\pump\node_modules\end-of-stream\node_modules\once\test\
   Windows 10: C:\Program Files\ALLPlayer\ALLTorrent\peerflix\node_modules\torrent-stream\node_modules\bittorrent-dht\node_modules\once\test\
   Windows 10: C:\Program Files\ALLPlayer\ALLTorrent\peerflix\node_modules\torrent-stream\node_modules\end-of-stream\node_modules\once\test\
   Windows 10: C:\Program Files\ALLPlayer\ALLTorrent\peerflix\node_modules\torrent-stream\node_modules\peer-wire-swarm\node_modules\once\test\
   Windows 10: C:\Program Files\ALLPlayer\ALLTorrent\peerflix\node_modules\pump\node_modules\end-of-stream\node_modules\once\
   Windows 10: C:\Program Files\ALLPlayer\ALLTorrent\peerflix\node_modules\torrent-stream\node_modules\bittorrent-dht\node_modules\once\
   Windows 10: C:\Program Files\ALLPlayer\ALLTorrent\peerflix\node_modules\torrent-stream\node_modules\end-of-stream\node_modules\once\
   Windows 10: C:\Program Files\ALLPlayer\ALLTorrent\peerflix\node_modules\torrent-stream\node_modules\peer-wire-swarm\node_modules\once\
   Windows 10: C:\Program Files (x86)\Common Files\Adobe\Creative Cloud Libraries\js\node_modules\once\
   Windows 10: C:\Program Files (x86)\Common Files\Adobe\Creative Cloud Libraries\js\node_modules\lodash\
   Windows 10: C:\Program Files (x86)\Common Files\Adobe\Creative Cloud Libraries\js\node_modules\lodash\fp\
   Windows 10: C:\Program Files (x86)\Common Files\Adobe\Creative Cloud Libraries\js\node_modules\once\
   Windows 10: C:\Program Files (x86)\Common Files\Adobe\Creative Cloud Libraries\js\node_modules\lodash\
   Windows 10: C:\Program Files (x86)\Common Files\Adobe\Creative Cloud Libraries\js\node_modules\lodash\fp\
   
4. Restart your computer.

If this final step has failed and you're still encountering the error, you're only remaining option is to do a clean installation of Windows 10.

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