I am having trouble generating object lod for my custom world if I try to use anything from Dawnguard.

These are the latest errors...
This is what the object generator says:
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 texture name.
This is what I am getting from the EditorWarnings.txt:
TEXTURES: Texture Set missing texture textures\dlc01\lod\DLC01_CastleExtLod01.dds.
TEXTURES: Texture Set missing texture textures\dlc01\lod\DLC01_CastleExtLod01_n.dds.
MODELS: Missing DDS textures for object DLC01CasixtMainTowerBridge01_LOD_0:19--check editorwarnings.txt for texture name.