Crashes and errors when joining

Almost every error when joining is not a server problem but something on your PC: modified game files, a second FiveM running or a Cfx.re sign-in failure. Find your message below and follow the steps in order.

#"Invalid modified game files" (pure mode)

What you see. A FiveM window "Invalid modified game files" with a file path, for example x64\audio\sfx\PROLOGUE.rpf, or the words "pure mode". You can't get in.

Why. The server only lets in clean game files: that's its protection against cheats. One of your game files is modified or damaged: an OpenIV mod, a "tweak", a failed update.

What to do.

1. Verify the game files in your launcher:
   • Rockstar Games Launcher: Settings → My installed games → GTA V Legacy → "Verify Integrity".
   • Steam: Library → GTA V Legacy → Properties → Installed Files → "Verify integrity of game files".
   • Epic Games Store: Library → ⋯ on GTA V Legacy → Manage → "Verify".
2. Remove mods: everything installed with OpenIV, the mods folder in the game folder and mods in %localappdata%\FiveM\FiveM.app\mods.
3. Still no luck: delete the file named in the error (the path starts at the game folder) and run the check from step 1 again. The launcher downloads the file again.
4. Start the game once and wait for the main menu, then join the server.

#Cfx.re sign-in error (HTTP 503)

What you see. "There was an issue while authenticating your game session", "HTTP 503" or "Failed to connect to authentication services in a reasonable timespan".

Why. FiveM didn't pass the check on the Cfx.re servers, FiveM's own service. You haven't reached our server yet, it's fine.

What to do.

1. Wait a couple of minutes and restart FiveM.
2. Change your DNS to 1.1.1.1 or 8.8.8.8 in the Windows network settings.
3. Turn a VPN on, or off if you use one.
4. Check that your antivirus or firewall isn't blocking FiveM.

#"Failed to initialize LinkProtocolIPC"

What you see. "Failed to initialize LinkProtocolIPC, master is already initialized".

Why. FiveM is already running and you opened it a second time.

What to do. Close every FiveM process: Ctrl + Shift + Esc → everything that starts with FiveM → "End task". Start it again. In the COLDZ launcher press "Play" only once.

#Wrong game version

FiveM only works with GTA V Legacy, it won't start with Enhanced. On Steam, Legacy is a separate game in your library; in the Epic Games Store and the Rockstar Games Launcher install Legacy too. More in Getting started.

#The game closed itself: "Game integrity check failed"

What you see. A FiveM crash window saying "Early-exit trap" or "Game integrity check failed", with something like GTA5_b3889.exe+1028.

Why. FiveM's anti-cheat closed the game itself: it saw something foreign in the game process. It's not a ban and not a server crash.

What to do.

• Close Steam completely or leave the Steam client beta, turn off Family View.
• Close overlays and recorders: Discord overlay, MSI Afterburner and RivaTuner, GeForce Experience, Medal, ReShade.
• Delete mods from the game folder and from FiveM.app\mods, delete cheats and "FPS boosters", even ones for other games.
• Verify the game files (as in the first section) and scan your PC with an antivirus.
• Intel 13th or 14th gen CPU: update your motherboard BIOS.

#A crash while loading or in game

1. In the crash window press "Save information" or note the report ID.
2. Find the newest file in %localappdata%\FiveM\FiveM.app\crashes and the CitizenFX_log for that hour in %localappdata%\FiveM\FiveM.app\logs.
3. Describe the crash with the "Bug" button at the bottom of the site: what you were doing, your graphics card, memory and the graphics level in F2. Send the files in our Discord.