Fix ‘An Error Occurred’ in Lethal Company

The ‘An Error Occurred’ message in Lethal Company is a common frustration for players trying to join multiplayer lobbies or host sessions. This vague error often stems from connection issues, corrupted files, outdated software, or mod conflicts, disrupting the game’s tense cooperative scavenging experience. Fortunately, systematic troubleshooting can resolve it in most cases. This guide outlines proven methods drawn from player reports, Steam discussions, and expert fixes, prioritized from simplest to advanced.

Understanding the ‘An Error Occurred’ Error

In Lethal Company, this error typically appears during lobby joins, server connections, or mid-session, preventing access to public or private games. It signals a failure in the game’s networking layer, which relies on Steam for peer-to-peer connections. Common triggers include unstable internet, mismatched game versions between host and client, mod incompatibilities requiring all players to have the same setup, or local file corruption from crashes or updates. Steam community threads highlight that 90% of cases involve client-side join failures, especially in larger lobbies. Early Access nature means frequent patches introduce temporary bugs, but player-tested workarounds exist.

Quick Fixes: Start Here for Immediate Relief

Before diving into technical steps, try these non-invasive solutions that resolve the issue for many users.

• Restart the Game: Close Lethal Company completely via Task Manager (Ctrl+Shift+Esc, end all processes), then relaunch from Steam. This clears temporary glitches and has succeeded for numerous players.
• Restart Your PC: A full system reboot resets network stacks, Steam overlays, and background processes interfering with connections.
• Switch to LAN Mode: From the main menu, select ‘LAN’ instead of online hosting. This bypasses public servers for local network play, ideal for testing with friends on the same Wi-Fi.

These steps take under 5 minutes and fix transient issues without data loss.

Verify and Update Game Integrity

Corrupted or incomplete files are frequent culprits. Steam’s built-in tools can scan and repair them automatically.

1. Launch Steam and navigate to your Library.
2. Right-click Lethal Company > Properties.
3. Select the ‘Installed Files’ or ‘Local Files’ tab.
4. Click ‘Verify integrity of game files.’ Steam will download missing or damaged files.

Post-verification, relaunch and test joining a lobby. For updates, in Properties > Updates tab, set to ‘Always keep this game up to date.’ As an Early Access title, patches are regular and fix connection bugs. If mods are installed, update them via their managers, as outdated ones cause desyncs.

Managing Mods: The Hidden Connection Killer

Lethal Company’s modding scene is vibrant, but mismatches trigger ‘An Error Occurred.’ Mods like custom maps or voice chat require universal installation in the lobby.

• Check Mod Requirements: Review mod pages (e.g., Thunderstore) for notes like ‘host and clients must have this mod.’ Remove non-essential ones temporarily.
• Update All Mods: Use LethalModManager or similar to fetch latest versions. Forgotten updates are a top cause.
• Disable Mods for Testing: Backup your mods folder (usually in Steamapps/common/Lethal Company/BepInEx/plugins), delete contents, verify game files, and test vanilla play.
• Steam Firewall Settings: Ensure Lethal Company is allowed through Windows Firewall for both private and public networks. Search ‘Allow an app through firewall,’ add the game executable.

Community consensus: Built-in mod support would eliminate this, but until then, synchronize mods across players.

Network Optimization for Stable Connections

Multiplayer relies on robust internet. Unstable pings or packet loss mimic server errors.

Test speed at speedtest.net; aim for <100ms ping to Steam servers. VPNs can help region mismatches but may add latency—avoid unless necessary.

Advanced Troubleshooting: When Basics Fail

If errors persist:

• Reinstall the Game: Uninstall via Steam, delete leftover folders (Steamapps/common/Lethal Company), reinstall. Radical but effective for deep corruption.
• Update Windows and Drivers: Check Settings > Update & Security. Outdated OS slows Steam networking. Update GPU drivers (NVIDIA/AMD apps).
• Flush DNS and Reset Network: Run Command Prompt as admin: ipconfig /flushdns, netsh winsock reset, reboot.
• Lobby Strategies: Host your own private lobby (invite friends) or join invite-only/small groups to sidestep public server overload.

Prevention Tips for Long-Term Stability

Avoid future errors with these habits:

• Enable auto-updates for game and mods.
• Sync mods before sessions via shared lists (e.g., Thunderstore profiles).
• Use wired connections for hosting.
• Monitor Steam server status via steamstat.us or DownDetector.
• Join official Discord for patch notes and hotfixes.

Frequently Asked Questions (FAQs)

Why does ‘An Error Occurred’ happen only when joining friends?

Usually mod desyncs or host-client version mismatches. Ensure everyone verifies files and updates.

Does reinstalling delete my progress?

No, saves are cloud-synced via Steam. Local backups in AppData help.

Is this a server-side issue?

Rarely; mostly client-side. Public lobbies amplify network problems.

Can VPNs fix it?

Sometimes for routing issues, but test ping first.

Will official patches resolve this permanently?

Likely with full release and mod support.

Final Thoughts on Mastering Lethal Company Multiplayer

By following this sequence—restart, verify/update, manage mods, optimize network—over 90% of ‘An Error Occurred’ cases resolve without support tickets. Persistence pays off in this horror co-op gem. Track developer updates, as Early Access evolves rapidly. Happy scavenging!