MTA:SA launcher code

MTA:SA error CL30

A file MTA checks is missing or has been changed.

How to fix it

1. Read which file it names

   The message names one file and says if it is missing or modified. MTA looks for that file in the mta folder inside your MTA installation folder.

   Source: MTA source code

2. Make sure an anti-virus is running

   If no anti-virus is running on your PC, install one. MTA's help page lists free ones: Bitdefender Antivirus Free, Avast Free Antivirus, AVG AntiVirus Free and Malwarebytes Free.

   Source: MTA help

3. Update it and scan the whole PC

   Update your anti-virus and check that real-time scanning is on. Then run a complete virus scan of the computer.

   Source: MTA help

4. Reinstall MTA

   Install Multi Theft Auto again. MTA's help page links one installer for Windows 10 and 11, and another for Windows 7 and 8.x.

   Source: MTA help

5. Start MTA again

   Start MTA and see if the message is gone.

   Source: MTA help

These are the steps of the guide CL30: Data file is missing or modified. Possible virus activity.

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.

About this code

CL codes come from MTA's launcher, before the game starts: installing an update, finding GTA, loading MTA's own files or starting gta_sa.exe. MTA's own documentation gives CL30 as Missing/altered data integrity.

All fix guides · Every MTA:SA error code · Crash codes and offsets