Has anyone tried to regenerate the world LOD in Tamriel with Dawnguard as a parent master? Every time i try to do this with my mod i get this error:

Building object texture atlas...
Texture atlas build failed with the following errors:
Missing DDS textures for object DLC01CasixtMainTowerBridge01_LOD_0:19--check editorwarnings.txt for

It has something to do with Castle Volkhiar. Everything is extracted and done as per the World Generation Tutorial here on site says, BSAopt and all that. Anyone figured a workaround except removing Dawnguard as a master? That's not a option in this instance.