Open your antivirus history/quarantine folder. If the file is there, restore it and add the game’s installation folder to your Exclusions Reinstall the Ubisoft Overlay

Download and install the latest version directly from the official Ubisoft Connect website.

Under the tab, uncheck "Enable in-game overlay for supported games." Restart your game. 2. Verify Game Files

For PC players, corrupted game files can cause issues.

Ubisoft frequently updates its launcher and games. Running an outdated version can lead to mismatched function calls. A patch may have renamed or removed the “uplay-ach-earnachievement” reference in the code, but an older game version still tries to call it.