How to fix League of Legends error 004

Ivan Jenic
by Ivan Jenic
Troubleshooting Expert
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Now and then, Riot releases a new patch for League of Legends to fix bugs and improve the player experience. Even though the purpose of patches is to make the game better, installing one of these updates can turn into a nightmare for some.

Namely, as soon as the game finishes installing the patch, it becomes unresponsive on launch and players are not able to pass the loading screen. Even worse, nothing but the dark screen appears on start. This problem is known as error 004.

Both players and the development team have been trying to deal with these issues for quite some time, but somehow it re-appears with almost every new patch. Unfortunately, there’s no confirmed solution for this issue, but some users found at least something that might be of help.

How do I fix League of Legends error 004?

1. Use the Hextech Repair tool

One player reported on the forums that reinstalling the game with the Hextech Repair tool managed to solve the error 004. In case you’re not familiar, this tool is used for various troubleshooting purposes in League of Legends, including reinstallation, firewall management, repatching, and more.

If you notice that your game becomes unresponsive after installing a certain patch and the error 004 shows up, try using this tool to repair it. This is an official tool provided by Riot Games and it was intended for all kinds of issues.

You can download the Hextech Repair tool — it’s completely free of charge. When you install and open it, you’ll notice the option to reinstall the game. Reinstall League of Legends with this tool and see if the error persists after.

2. Re-install League of Legends

remove league of legends

  1. Click on the Start button and type Control Panel
  2. Open Control Panel and go to Programs and Features
  3. Find League of Legends in the list and select it
  4. Click Uninstall and follow the wizard

Once you have uninstalled League of Legends, check to see if all the additional game files have been deleted

  1. Navigate to your installation folder and delete the contents if it still present
  2. Navigate to the path below and delete the Riot Games folder C: > Users > [your username] > AppData > Local
  3. Optional Step: Use a system cleaner like Ccleaner to remove any leftovers (or you can run the Windows Disk CleanUp Utility)

If you want to fix League of Legends error 004, then reinstalling the game is a good way to start. This is because this error can be caused by game files which have been corrupted during the patching process.

Control Panel not opening on your PC? Don’t worry, we have a guide to help you

3. Run the game as an administrator

run league of legends as an administrator

  1. Navigate to your install directory
  2. Right-click on League of Legends.exe
  3. Select Properties
  4. Go to Compatibility
  5. Tick Run this program as an administrator
  6. Repeat steps 3-5 for LeagueClient.exe

4. Repair the game files

league of legends issues

  1. Start the Riot game launcher
  2. Open the settings menu from the cog icon
  3. Go to the General Tab
  4. Click on Initiate Full Repair

In case you know more about error 004 in League of Legends and any other ways to solve it, please let us know in the comments below. We’re sure many of your fellow players will be thankful.

FAQ: Common League of Legends Questions

  • How do I reinstall League of Legends?

You can easily reinstall LoL by following the steps listed above.

  • How do I uninstall League of Legends?

You can uninstall League of Legends from Control Panel. Simply follow the instructions provided in this guide.

  • How do you repair League of Legends?

You can use the game launcher to repair League of Legends as shown above. Also, if you are experiencing crashes with the game, you can find the solutions in our dedicated guide.

  • Can I move League of Legends to another drive?

Whilst the League of Legends client does not offer the option to move the game files to a different folder or drive, you can manually copy the files over. That being said, we recommend that you go the safer route and uninstall the game and install it on your preferred drive. Just follow the instructions in this guide to reinstall the game.

Editor’s Note: This post was originally published in March 2019 and has been since revamped and updated in March 2020 for freshness, accuracy, and comprehensiveness.

Editor's Note: This article was originally published in January 2017 and was revamped and updated in June 2020 for freshness, accuracy, and comprehensiveness.