MTA:SA installer code
MTA:SA error U01
The MTA installation did not complete.
How to fix it
Repair your MTA installation
Run the current installer from multitheftauto.com over your existing installation. It replaces MTA's own files without touching your settings.
Run the installer as administrator
Right click the installer and choose Run as administrator, and allow it through your security software while it runs.
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
U codes come from the MTA installer itself. MTA's own documentation gives U01 as Installation incomplete.
All fix guides · Every MTA:SA error code · Crash codes and offsets
Where this comes from
Read on 5 September 2026 and written in our own words here.