FiveM / RedM Error Code 127
A player's FiveM will not start. This is on their computer, not on your server.
Do this first
Have them clear their FiveM cache and reinstall the Visual C++ Redistributable.
What it means
The FiveM client failed to start or was rejected. 127 is not one problem: Cfx uses it for several unrelated launch failures, which is why the fixes people post for it contradict each other.
What causes it
Ordered by how often it is the answer.
- 1
A client / server build revision mismatch
The most common right after a FiveM update. Your client and the server were built against different revisions. It resolves itself once both sides update, and there is nothing to fix on the server.
- 2
A missing or corrupted Visual C++ runtime
vcruntime140.dllormsvcp140.dll. Reinstalling the Visual C++ Redistributable fixes it. - 3
The Rockstar launcher running as administrator
FiveM and a launcher at different privilege levels cannot talk. Run both the same way, normally neither elevated.
- 4
A corrupted FiveM install or cache
Deleting the cache folder is the standard first move.
- 5
Antivirus quarantining a FiveM component
Windows Defender in particular.
How to tell which one is yours
Did it start happening for everyone at once, right after an update? Then it is the build mismatch and it is temporary. Did it start on ONE machine? Then it is the runtime, the launcher or the cache on that machine.
Where to look
Nothing server-side. This is a client problem, and a server owner cannot fix it for a player beyond telling them which of the above to try.
How to fix it
In order of how often it works: delete %localappdata%\FiveM\FiveM.app\cache, reinstall the Visual C++ Redistributable, stop running the Rockstar launcher as administrator, then reinstall FiveM.
Still stuck on your own code?
This page is what this error usually means. Paste your console into Server Fixer and it will rank everything in it and tell you what to do first, and if you would rather not touch it, ORBIE can repair the script and hand the resource back ready to drop in.
bug_reportOpen Server Fixer