The good news is that this error is with your game's core files. It is almost always a version mismatch caused by a recent, minor Steam update to the base game.
An outdated or broken CSP version frequently throws version compatibility errors. Go to > Custom Shaders Patch > About & Updates . Look at the list of available versions on the right. assetto corsa is obsolete v1163 is required link
Visit the official Assetto Corsa Content Manager Download Hub to download the absolute latest executable release. The good news is that this error is