I was unable to find any thread discussing this error message. I started receiving it a couple of days ago, and now I receive it every time I render. I'm not running out of disk space or RAM while rendering or anything like that. Obviously the message means that an ".aecache" couldn't be found, but I'm not sure why it is looking for a cache in the first place? I've set up the output renders to re-render everything (i.e. not use any caches). The project basically consists of mainly green screen (Keylight) and color correction (Lumetri Color). I'm using the latest available version of AE.