Help:VE284

Empty bone name in mesh file: <file> (original name: '<name>').

A bone in this mesh's skeleton has no usable name. This usually happens when a bone is left unnamed in the 3D modelling tool, or its name is lost or stripped during export.

Bones must be uniquely named so that animations and attachments can reference them. Give every bone a valid name and re-export the mesh.

From trainz-build 5.8 this is reported as an error; on earlier assets it is a warning.