MTA:SA launcher code
MTA:SA error CL21
A file in the GTA folder is in MTA's way.
How to fix it
Find the mod file the warning names
Close MTA. Look in the GTA and MTA installation folders for the ASI plugin that the warning names. For a DLL clash, look for the exact file name shown.
Source: MTA help
Move that mod out, and keep a backup
Only for files in these game installations that you have found and know belong to a mod.
Follow the mod’s own uninstall instructions, or move that plugin to a backup folder outside the game and MTA folders. For a d3d9.dll graphics mod, only touch the copy that the mod put next to GTA’s program file.
Careful: Do not delete Windows DLLs or files you do not know. Keep the backup outside the game subfolders that are scanned.
Start MTA without the mod
If MTA now opens, leave that mod out of the MTA game installation: it is not compatible. If it still fails, note the exact new message before you change another file.
Source: MTA help
These are the steps of the guide ASI plugins or a game-folder DLL block MTA.
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
A d3d9.dll, an ASI loader or another mod file in the game folder stops MTA starting.
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 CL21 as Conflicting GTA-directory file.
All fix guides · Every MTA:SA error code · Crash codes and offsets
Where this comes from
- github.com/multitheftauto/mtasa-blue/blob/489c5d1c7631de313f9ef7a53d455fc5ab20ea4f/Client/loader
- help.multitheftauto.com/guides/how-to-remove-asi-files/
- help.multitheftauto.com/sa/trouble/launch-msvcr-dll-missing/
Read on 5 September 2026 and written in our own words here.