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关闭文档时出现错误。从 PdfCopy 调用函数“FixTaggedStructure”时抛出它

        Dictionary<int, PdfIndirectReference> numTree = structureTreeRoot.NumTree;

我的调试器显示“structureTreeRoot”为空，但我不知道为什么。

我的代码非常简单。我正在尝试将 PDF 转换为 PDF/A-1，请 参阅将 PDF 转换为 PDF/A3 或将 PDF/A-1 转换为 PDF/A-3

        Document doc = new Document();
        FileStream fs = new FileStream(destPdfA, FileMode.Create);
        PdfReader reader = new PdfReader(pdfParth);
        PdfCopy copy = new PdfCopy(doc, fs);

        copy.SetPdfVersion(PdfCopy.PDF_VERSION_1_4);
        copy.SetTagged();
        copy.CreateXmpMetadata();

        doc.Open();
        ICC_Profile icc = ICC_Profile.GetInstance(new FileStream(ICM, FileMode.Open));

        PdfDictionary outi = new PdfDictionary(PdfName.OUTPUTINTENT);
        outi.Put(PdfName.OUTPUTCONDITIONIDENTIFIER, new PdfString("sRGB IEC61966-2.1"));
        outi.Put(PdfName.INFO, new PdfString("sRGB IEC61966-2.1"));
        outi.Put(PdfName.S, PdfName.GTS_PDFA1);

        // get this file here: http://old.nabble.com/attachment/10971467/0/srgb.profile
        PdfICCBased ib = new PdfICCBased(icc);
        ib.Remove(PdfName.ALTERNATE);
        outi.Put(PdfName.DESTOUTPUTPROFILE, copy.AddToBody(ib).IndirectReference);

        copy.ExtraCatalog.Put(PdfName.OUTPUTINTENTS, outi);

        copy.AddDocument(reader);
        doc.Close();
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