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Thank you for considering Aspose.
Well, we are not sure whether you are using Aspose.Cells for .NET or Aspose.Cells for Reporting Services. Please let us know the product and the version you are using. Also, I have attached the latest version of Aspose.Cells for .NET to check whether it works fine for you (if you are using Aspose.Cells for .NET). Also, following is the documentation link for your reference regarding smart markers:
Thank You & Best Regards,