MTA:SA fix
MTA file version mismatch or incompatible network module
Install one complete, current MTA. That replaces a mix of old and new MTA files.
Network module not compatible
Codes on this page: CL40
Steps
Close every running MTA
Close the launcher and the game before you replace MTA’s files.
Source: MTA help
Install one complete official release
Run the current official MTA installer for the installation you use. Do not mix netc.dll or other modules from old downloads with a newer MTA.
Source: MTA help, MTA help, MTA download
Start MTA from the updated copy
Check that your shortcut opens the installation you updated, then try again from it. If it still reports a mismatch, put the complete module name and the versions shown in your support request.
Still not fixed? Copy the whole message, not only the code, and check your log in the Fix tool. It is read on your own computer.
Other problems like this
- CL31: a GTA file could not be opened
- ASI plugins or a game-folder DLL block MTA
- NVIDIA Optimus warning or hybrid-GPU startup trouble
- GTA fails to open or crashes before MTA starts
- MTA reports low disk space
- MTA cannot find required Windows fonts
All fix guides · Every MTA:SA error code · Crash codes and offsets
Where this comes from
Official MTA guidance
- help.multitheftauto.com/sa/trouble/bad-file-version/
- help.multitheftauto.com/sa/trouble/netc-not-compatible/
- multitheftauto.com/
- forum.multitheftauto.com/forum/83-client/
Read on 7 September 2026 and written in our own words here.