When generating proxy meshes, the HLOD fails in some cases (already reported elsewhere: seems to be when custom lightmaps or lightmaps in channel >1 are used).
the report looks like this:
LogStaticMesh: Building static mesh LOD_SM_Bookcase_London_C_H209…
LogMeshUtilities: Error: Raw mesh is corrupt for LOD0.
LogStaticMesh: Error: Failed to build static mesh. See previous line(s) for details.
The issue is that the reported mesh (SM_Bookcase. in this example) is not actually the one with the problem, it’s just the first one in the list. If there are many meshes in the HLOD, this can be quite a pain since you have to try one-by-one which mesh is the issue.
If more info is needed, let me know!