<PackageReference Include="System.ServiceModel.Primitives" Version="6.1.0" />

System.ServiceModel.ExceptionDetail

public class ExceptionDetail
namespace System.ServiceModel { public class ExceptionDetail { public string HelpLink { get; set; } public ExceptionDetail InnerException { get; set; } public string Message { get; set; } public string StackTrace { get; set; } public string Type { get; set; } public ExceptionDetail(Exception exception); } }