What are USP.lua Error Messages?

General USP.lua Runtime Errors

USP.lua file errors often occur during the startup phase of Half-Life 2 Garry's mod, but can also occur while the program is running. These types LUA errors are also known as “runtime errors” because they occur while Half-Life 2 Garry's mod is running. Here are some of the most common USP.lua runtime errors:

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

Most LUA errors are due to missing or corrupt files. Your USP.lua file could be missing due to accidental deletion, uninstalled as a shared file of another program (shared with Half-Life 2 Garry's mod), or deleted by a malware infection. Furthermore, USP.lua file corruption could be caused from a power outage when loading Half-Life 2 Garry's mod, system crash while loading or saving USP.lua, 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 USP.lua 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 USP.lua 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 USP.lua error, please proceed to the Step 2 below.

You can uninstall Half-Life 2 Garry's mod 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 Half-Life 2 Garry's mod 9.04 and click "Uninstall"
5. Follow the prompts for uninstallation.

After the software has been fully uninstalled, restart your PC and reinstall Half-Life 2 Garry's mod software.

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

Half-Life 2 Garry's mod 9.04

Garry

When the first two steps haven't solved your issue, it might be a good idea to run Windows Update. Many USP.lua 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 USP.lua 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 USP.lua 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 USP.lua file version. We maintain a comprehensive database of 100% malware-free USP.lua files for every applicable version of Half-Life 2 Garry's mod. 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 USP.lua Files".
2. Click the appropriate "Download Now" button and download your Windows file version.
3. Copy this file to the appropriate Half-Life 2 Garry's mod folder location:
   
   Windows 10: C:\Program Files (x86)\gmod9\gmod9\lua\weapons\Counter-Strike\
   
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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