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ExternalApplicationException

Class
Description:
The exception that is thrown when an issue in the Add-Ins resulted in an unexpected error.
Remarks:
Please contact your external application provider with the information about what led to this exception.
Inheritance Hierarchy:
System.Object
  System.Exception
    Autodesk.Revit.Exceptions.ApplicationException
      Autodesk.Revit.Exceptions.ExternalApplicationException
Syntax
[SerializableAttribute]
public class ExternalApplicationException : ApplicationException