@Prokane99 Quick necro as I experienced the Tamriel (-5,10) error while attempting to build DynDOLOD after caching my Verdant grass. This is due to FPS Grass Booster - Verdant being enabled and added grass in an area where no grass exists (Labyrinthian). Disable this mod PRIOR to generating your cache and you won't have the issue. Enable once you complete your tasks with DynDOLOD.
I also follow this guide which has worked well for me. https://github.com/The-Animonculory/Modding-Resources/blob/main/Grass Lods.md
Delete if necro is prohibited. Just wanted to share my resolution so that it may help others.