Option conflict between rooms in the Revit link '[Link Instance Name]'.\nThe room in the Revit link's option '[Option Name in Link]' overlaps a room in the main model.\nTo resolve the issue, open the Revit link file for editing, select the main model room, and use the Add to Design Option Set tool. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
Syntax
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