The mod is looking for a shared sound bank (e.g., Ferrari_458). Solution: Open the car folder, find sfx/guidelines.txt . You likely need to install the "AC_Shared_Sounds" pack (included in the 1,164 SYSTEM folder).
A massive extension that adds modern features like night racing, dynamic light, rain (with the paid preview), and physics optimizations. It is typically installed directly through Content Manager's settings menu. assetto corsa 1164 mods link