Errors for the Free Form Rebar 
   Namespace:   Autodesk.Revit.DB.Structure  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 18.0.0.0 (18.2.0.0) 
Syntax
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Members
| Member name | Description | 
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| Success | Operation was done with success. | 
| Undefined | An unexpected error occured. | 
| NullCurve | One or more of the input curves was null. | 
| UnboundCurve | One or more of the input curves was unbounded. | 
| InvalidLoop | Curves doesn't form a valid curve loop. | 
| RebarCantBeBent | A rebar constructed from curves can't be bent according to the bending radius. |