When starting Postal 2 gives an error! (Postal 2)

I bought the game on Steam, played it several times, and one day I launch the game, and it gives me an error. Reinstalled the game, didn't help. Error description below, what should I do?

Can't find 'ini:Engine.Engine.GameEngine' in configuration file

History: UObject::SafeLoadError <- UObject::StaticLoadClass <- InitEngine