Help:VE35
From TrainzOnline
VE35: Required alias mesh asset asset-kuid is missing and cannot be validated.
The asset includes a reference to a mesh-asset in the mesh-table container, but that asset is not available for validation. Therefore tags that are dependent on that alias mesh, such as mesh names, mesh attachment points or mesh textures, will not be found and cannot be validated.
This error may be the first in a series of errors, each one relating to the unavailable alias asset.
The error can be fixed by installing the missing asset and ensuring it is not faulty, or, in the case of a DLS upload, by uploading the missing asset and ensuring it is on the DLS before uploading the asset that relies on it.