as mentioned to the other person, I'm not super familiar with Forums so i appreciate your patience. tbh i have no idea what mod is causing the issue with the cubemap, as i installed most of the files in a late night blur. with my finaggling i see it mention DLC01 and i turned off the mod i figured would cause the issue, which was immersive Fort DawnGuard, but i received the same error message.
https://ufile.io/qa49u3ga
Here is a Debug Log that i found, hope this helps.