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Getting Object Reference Error while calling PDF to PDF/A C# code

I took Nuget package and when trying to access this code then getting object reference error. a Blank PDF file is getting created.
using (var converter = new Converter(@“D:/sample.pdf”))
var options = new PdfConvertOptions();
options.PdfOptions.PdfFormat = PdfFormats.PdfA_3A;

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Please share following details and we’ll look into this scenario:

  • API version that you integrated (e.g. 22.6, 22.7)
  • Problematic/sample source file