This class contains information about a problem encountered while creating a KeyBasedTreeEntries object. 
   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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Remarks
 This problem might be a duplicate entry, or an error in the specified parent-child relationships, or something else. See BuiltInKeyBasedTreeEntryErrorType for details.