When called the first time, returns geometrical objects which were built. Later calls will throw exceptions. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2015 
Syntax
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Return Value
Geometrical object which were built.Remarks
 Normally an array contains a single geometrical object corresponding to either 'target' or 'fallback' type', but if multiple face sets are being built with target/fallback of "AnyGeometry/Mesh", then a two-element array with both geometry as the 1st element and mesh as the 2nd can be returned. It happens if some of the face sets require a fallback processing and some do not.