League of Legends error codes list: How to fix every error and what they mean

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Image via Riot Games

League of Legends is light enough to run on the most ancient gaming machines today. This allows the game to reach millions of players, but it also means it comes with its fair share of errors.

Although pretty much every new patch fixes some known bugs, they also tend to introduce others. Troubleshooting each and every one of them may look like a long and arduous task, but it’s not as bad as you may think.

While it may sound simple, we recommend restarting your PC and closing all running processes before trying out any of the solutions that are listed below.

Here are some of the most common errors in League and how to fix them.

Error nameSymptomsSolution
Error Code 0UUsually appears on the PBE client. The error code 0U causes the client display assets incorrectly and even shut down unexpectedly.Run the Hextech Repair Tool and try launching the game afterward. If it doesn’t work, try adding League as a Firewall exception and repatch the game. As a last resort, you can try reinstalling League through the Hextech Repair Tool.
League of Legends Error Code 004The error usually occurs when the client fails to patch the game.Failing to download or install an update either means there was a connection problem or there wasn’t enough disk space. Make sure that your connection is solid and you have enough space on your SSD or hard drive.
Error 7This error indicators Riot’s servers are overloaded, causing players to disconnect.Since this one’s a server related problem, your best bet is to keep trying to log in. Keeping an eye on League‘s Twitter account is also beneficial.
League of Legends Error 1BThe 1B error is usually related to ISP problems. It prevents players from logging into the game.Though the issue is known for fixing itself, you can try running the League client on administrative mode. If it doesn’t work, we recommend repairing your client.
Under maintenance errorThis error mostly affects Linux users and prevents the League client from receiving updates.Repairing the client should fix this problem. If that doesn’t do the trick, we recommend deleting RiotClientServices.old and ucrtbase.dll before giving it another go.
Unexpected Error With Login SessionThis login session error tends to arise when another instance of the League client gets stuck running in the background.To fix the error, launch the task manager and end all the tasks related to League. If it doesn’t fix the error, we recommend initiating a client repair.
Error: 0xc0000005Though the reason behind the error is unknown, it prevents players from logging into the game by blocking their access to the client.The error is a Windows issue. Try running the League client in administrator mode. If it doesn’t fix the problems, reinstall League after deleting all the files related to the game.
A critical error has occurredThis critical error is caused by other programs that feature overlay options while playing games. It prevents players from logging into League.Close all programs that have an overlay, like Steam, Origin, or Discord. After, locate your local League folder to delete the config and data folders.
Unexpected Login ErrorThis error usually shows up when you have a shaky connection. It prevents players from downloading updates or logging into the game.We recommend performing a router reset and changing your DNS. If these don’t work, try contacting your ISP and let them know about your problem.
Unknown direct x errorThis direct x error appears during graphical instabilities and prevents players from launching the League client.Though the error message prompts players to update their graphics drivers, deleting the game.cfg file should fix the problem.
League of Legends Error Code 002Much like the error code 004, this error also disrupts the patching process and makes it impossible to log into the game.This is another storage-related error. Make sure you have enough space on your data drivers. If that doesn’t seem to be a problem, try turning off your antivirus.
The program can’t start because d3dx9_43.dll is missing from your computer.This error mostly occurs in new PCs and prevents players from starting a match.Completing all the available Windows updates before launching League usually fixes the issue. If this doesn’t work, we recommend manually installing the file via the DirectX End-User Runtime Web Installer.

How to fix BugSplat and generic League of Legends crashes

It’s annoying to get kicked out of a game by a BugSplat crash. But you can find some comfort in knowing that you’re a part of League’s development. Don’t skip out on reporting these crashes via the pop-up and contribute to getting it fixed.

The majority of BugSplat and generic League crashes without a name occur due to overheating, corrupted game files, hardware issues, or outdated drivers.  

Update your graphics card drivers

Outdated drivers are one of the main causes of unknown crashes. New patches can also introduce undocumented changes that change the way League interacts with your GPU. These changes may require a driver update if they heavily depend on an upgrade by the GPU manufacturers.

Updating your graphics drivers should only take five to 10 minutes since both NVIDIA and AMD guide users through the process. Keep in mind that you should download the suitable version for your GPU by going through the lists.

Disable your antivirus

Antivirus software has a history of detecting false positives within League’s installation or updates files that prevents the client from launching. The main reason behind this is that most files get installed to your PC in a zipped format, which makes them harder to scan.

Disabling or at least setting an exception for League’s files should allow you to bypass any errors you encounter while trying to update your game.

Run LeagueClient and the game executable file in administrative mode

Limited user rights or programs with admin privileges can lead to crashing in League.

Running both the League client and the executable file of the game will ensure that the game reaches every bit of resource it needs to perform smoothly. 

Riot has a history of downloading new versions of these two files with every patch, so you may need to repeat this process every time a new patch hits the servers.

Repair your client and use the Hextech Repair Tool

Repairing your client ensures that there’s nothing wrong with your League files. It also repairs the corrupted files it encounters and downloads the missing ones.

Though the client repair tool may get the job done, the Hextech Repair Tool will come in handy if you encounter errors and bugs frequently.

Hextech Repair tool can: 

  • Perform easy reinstallations or repatches
  • Do firewall management
  • Displays known issues in your region
  • Keep logs of your crashes

These logs can be used by the League support team to pinpoint the source of your errors.