Could not produce class with ID 184

I'm seeing error logs about Could not produce class with ID 184 From `http://docs.unity3d.com/Manual/ClassIDReference.html` I've tried adding this line to `link.xml`: But the error persists? Other missing classes seem to be fine though. Is there a way to say `classId=184` instead of `fullname="UnityEngine.SubstanceArchive"`? Even better is there a way to prevent these errors all together?