Fortnite error LS-0013: real causes and how to deal with it

If you're trying to play Fortnite peacefully and you get the dreaded message “ Fortnite error LS-0013: The game won't start even though it's installed.“It's normal to get frustrated. In many cases, the problem is accompanied by the small Easy Anti-Cheat window loading to 100%, then suddenly disappearing and returning you to the home screen. epic games launcherwithout the game ever actually opening.

This bug doesn't only affect Fortnite: other titles like Hogwarts Legacy may display similar messages “Error starting, the game could not be started, please check the installation” after tweaking graphics options like ray tracing or other advanced features. If this situation sounds familiar, here you'll find a detailed explanation of why it happens, what the LS-0013 error really means, and What can you do to try to solve it step by step?Let's go

What is the LS-0013 error in Fortnite and why does it appear?

The code LS-0013 is a message from Epic Games Launcher indicating that The game cannot start even though the files are installed.This does not necessarily mean that data is missing, but rather that the launcher, Easy Anti-Cheat, or the system itself encounters a block preventing the executable from starting.

In the case of Fortnite, many players say the problem started after the start of a new season or after reinstalling the gameInitially, the LS-0013 code was displayed directly, and later, the error changed its behavior: the Easy Anti-Cheat window opens, loads to 100%, the screen closes without a visible error, and the Epic Games launcher reappears as if nothing had happened.

Something very similar happens with other titles that use this ecosystem, where a notice appears. “Could not start, check the installation” despite having reinstalled the game once or several times. In some cases, the trigger has been modifying advanced graphics settings (such as enabling ambient occlusion or ray tracing), restarting the game, and from then on, experiencing a black screen followed by crashing and a subsequent error message.

Common symptoms of the LS-0013 error and related problems

Before looking for solutions, it's helpful to understand the most common symptoms. Even if the message mentions installation, in many cases the game is downloaded correctly, but Some intermediate component is preventing it from running.

• Easy Anti-Cheat window that fills to 100% and disappears, without either the game menu or a subsequent loading screen appearing.
• The Epic Games launcher either reopens or remains in the foreground, as if You should have closed Fortnite normally.but without displaying a clear error message.
• Code appearance LS-0013 just when trying to start the game from the launcher library.
• Black screen when starting titles like Hogwarts Legacy, sudden shutdown and information box asking verify installation despite having reinstalled.
• The failure can begin to occur after change video options (DX11/DX12, ray tracing, ambient occlusion), or after reinstalling both Fortnite and the Epic Games Launcher itself.

In many of the reported cases, users have tried almost everything that Google typically recommends without success: Run as administrator, clear caches, repair, reinstall…so it's important to understand what might really be happening in the background.

Most frequent causes of the LS-0013 error and startup failures

Although the message is quite generic, there are several common reasons that explain why an installed game It refuses to start and returns LS-0013 or similar messages regarding installation verification.

Conflicts with Easy Anti-Cheat or with the system

Fortnite and many Epic-related games use Easy Anti-Cheat (EAC) to prevent online cheating, and if this service doesn't start properly, the game It closes without showing hardly any information to the user.It's common for the EAC window to reach 100%, but something may prevent the process from completing: corrupted files, insufficient permissions, blocking antivirus software, disabled system services, etc.

When EAC fails silently, the launcher usually interprets this as the game failing to start and displays LS-0013 or equivalent messageseven though the installation is actually correct and the problem lies in the anti-cheat module.

Administrator permissions and user account control

On some systems, granting or removing administrator privileges to Fortnite, the launcher, or Easy Anti-Cheat can make a difference, but There is no single rule that applies to everyone.Some players have tried running as administrator and disabling that option without noticing any change, precisely because the conflict occurs elsewhere: installation paths, Windows blocks, permissions on specific folders, etc.

What is common, however, is that there are mismatches between what the system allows and what the game needs: protected folders in Program Files, files that cannot be modified, or background services that require a specific permission level.

Corrupted files or problematic graphics settings

Although many users have already verified and reinstalled the game several times, it is still possible that certain configuration files or graphical settings They remain in an unstable state. Enabling ray tracing or options like ambient occlusion in demanding games can cause the title, after restarting, to attempt to load with parameters that your hardware or drivers don't handle well.

In these cases, it's relatively common for the screen to go black and the game to close without a clear explanation. Later, upon restarting, the system detects a problem loading the executable with the previous configuration and displays the classic warning. “Could not start, check the installation”although the error has more to do with the configuration than with the game data itself.

Problems with the Epic Games Launcher or the cache

The Epic Games Launcher itself may also be part of the problem if there is corrupted cache, outdated configurations, or processes hanging in the backgroundClearing the launcher's web cache is one of the common steps that many players have already tried, but sometimes it's not enough if not all processes are closed correctly, or if there are conflicts with accounts, installation paths, or incomplete updates.

In more extreme situations, even reinstalling the launcher and Fortnite multiple times doesn't change anything, because the root of the problem lies... in system services, drivers, or in the EAC itself that remain intact between each reinstallation.

Basic actions that have usually already been tested

Many of those who encounter the LS-0013 error or installation verification messages They have exhausted almost all standard solutions that appear in forums and quick guides, such as:

• Granting and removing administrator privileges to the Fortnite executable, to the Easy Anti-Cheat launcher, trying different combinations.
• Change Fortnite's graphics mode between DirectX 11 and DirectX 12 from the settings (when the game could still be opened before the error became permanent).
• Clear web cache of Epic Games Launcher and completely close the program, including background processes.
• Verify the game files several times in a row from the "Verify" option in the Epic library.
• Reinstall both the launcher and Fortnite once or twice, without changes in the fault behavior.

If you've already been through all of this and you're still in the same place, it's understandable that you feel completely lost. From here on out, it's best to focus on the possible less obvious causes and how to try to isolate what is blocking the startup.

Review Easy Anti-Cheat and related services

When all you see is the Easy Anti-Cheat window filling up to 100% and then disappearing, the priority is to check that EAC is properly installed, updated, and has sufficient permissions. to run and communicate with the system.

One way to address these types of errors is to locate the Easy Anti-Cheat folder within the game installation and ensure that the service can be run. repair or reinstall from your own wizard or follow a guide to Restart Fortnite on PCAlthough many players don't do it, this process can fix corrupted anti-cheat files without needing to reinstall the entire game.

It's also recommended to check that you don't have any essential Windows services disabled, as some are necessary for the system to function correctly. Easy Anti-Cheat works correctlyIf the system blocks the creation of processes or access to certain folders, EAC stops abruptly without giving the user much information.

Interference from antivirus, firewalls, and other programs

Another common reason why a game might not start despite being installed is interference from antivirus, firewall, or third-party security softwareThese programs can quarantine components of Easy Anti-Cheat or the game, not always with a visible alert, causing the startup to fail silently.

In cases where the LS-0013 error persists after multiple reinstallations, it may be helpful to review the antivirus history. Create exclusions for the game and launcher foldersand check that your firewall isn't preventing EAC or Fortnite itself from communicating with its servers. Some advanced firewalls can block connections necessary for the anti-cheat to validate your session.

Influence of corrupted graphics settings and configurations

The Hogwarts Legacy example is illustrative: a player activates ray tracing and ambient occlusionIt restarts, the screen goes black, the game closes, and then a message appears asking to verify the installation, although reinstalling doesn't fix anything. This pattern indicates that the problem may be in the graphical configuration or in settings files, rather than in the main game data.

When demanding parameters are changed, the game may attempt to load at a resolution, quality, or rendering mode that your computer can't handle well, or that conflicts with your GPU driver version. If the game engine fails to initialize, the most common cause is that It closes abruptly without giving many details.and that the launcher interprets that there is an installation failure.

A useful approach is to delete or rename the game configuration files in the user folder, so that The next time it starts up, it will be created from scratch with default values.This often returns the title to a hardware-compatible state, but it depends on the specific game and how it manages its configuration profiles.

Limitations of repeated reinstallations

Many players end up in a loop of verifying, reinstalling, and retrying without success. The fact that Reinstall the launcher and the game twice The fact that nothing has changed in the cases described makes it clear that it's not always a problem with corrupted game files. Often the source lies in:

• System services disabled, faulty graphics drivers or conflicting versions.
• Easy Anti-Cheat components corrupted or blocked for security.
• Configurations stored outside the main game folder that They are not deleted upon uninstallation.
• Permissions or installation paths that remain the same after each reinstallation.

It's frustrating, but it's important to understand that if the problem lies with the operating system, EAC, or user settings, Downloading tens of gigabytes again won't change the result; consultation How much space does Fortnite take up on PC?It's more effective to spend time reviewing those other components.

Case study: Typical player experience with LS-0013

To better understand the situation, it's worth reviewing a common experience among some Fortnite players when a new season arrives. They initially played without problems, but suddenly an error appears. LS-0013 when trying to startAfter searching for solutions, they try the following:

• They run Fortnite and Epic Games Launcher as administrator, and then run them again without elevated permissions, without noticing any difference.
• From the game's own video settings, they change between DirectX 11 and DirectX 12trying to get one of the modes to allow startup.
• They access the launcher's settings menu and clear web cacheThey close all Epic processes and restart the PC in case there are temporary files causing problems.
• They use Fortnite's file verification feature several times, without any notable errors appearing.
• Finally, they uninstall both the game and the Epic launcher, reinstall them on the same drive, and even try changing the disk.

The result, however, remains the same: the Easy Anti-Cheat window appears, the bar fills to 100%, it closes, and the game never opensAfter all this process, the feeling is one of not knowing what else to try, because almost all the general solutions found on Google have been unsuccessfully tested.

In situations like this, the key is to accept that the problem isn't just occurring with the Fortnite installation, but in the interaction between the system, Easy Anti-Cheat, the drivers, security, and user settingsAnalyzing each of those parts is usually more effective than repeatedly reinstalling them.

All of the above shows that the “LS-0013 Error in Fortnite: the game does not start even though it is installed” and equivalent messages in other titles These are not simple notifications that files are missing.Rather, it's just the tip of the iceberg of conflicts between the game, the anti-cheat, the system, and the user's own settings. Understanding the symptoms (the Easy Anti-Cheat window reaching 100% and then disappearing, black screens, sudden crashes, warnings to verify the installation after adjusting settings like ray tracing or ambient occlusion) helps to better focus on possible solutions, which involve a more thorough review of permissions, services, antivirus software, drivers, and configuration files instead of relying solely on repeatedly verifying or reinstalling.