That message is normal.
When you switch a layer's underlying feature source, if the properties the layer is referencing in the previous feature source do not exist in the new feature source, then Studio will warn you with that cryptic message.
Also have you specified the table in question as a Geometry table? Have you specified the X and Y columns?
- Jackie
http://themapguyde.blogspot.com
http://au.linkedin.com/in/jackieng