Retrieves the unique identifier of the FailureDefinition. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2011 
Syntax
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Return Value
The unique identifier of the FailureDefinition.Exceptions
| Exception | Condition | 
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| Autodesk.Revit.Exceptions InvalidOperationException | The FailureDefinitionAccessor has not been properly initialized. |