找到无效的嵌套标记div，在itextsharp XMLWorkerHelper中预期结束标记脚本异常

Question

我正在使用下面的代码将sharepoint aspx页面内容转换为pdf但在解析htmlstring时抛出此错误：“找到无效的嵌套标记div，预期结束标记脚本”如何处理这种无效标记或标记关闭通过C＃代码发布，以便我可以将有效的htmlString传递给方法。

//Create a byte array that will eventually hold our final PDF
Byte[] bytes;
//Boilerplate iTextSharp setup here
//Create a stream that we can write to, in this case a MemoryStream
using (var ms = new MemoryStream()) {
    //Create an iTextSharp Document which is an abstraction of a PDF but **NOT** a PDF
    using (var doc = new Document()) {
        //Create a writer that's bound to our PDF abstraction and our stream
        using (var writer = PdfWriter.GetInstance(doc, ms)) {
            //Open the document for writing
            doc.Open();

            //Our sample HTML
            var example_html = GetHtmlSource(HttpContext.Current.Request.Url.ToString());                  
            using (var srHtml = new StringReader(example_html)) {
                //Parse the HTML
                iTextSharp.tool.xml.XMLWorkerHelper.GetInstance().ParseXHtml(writer, doc, srHtml);   **In this line throwing exception**
            }                                         
        } 
        doc.Close();
    }
}    
bytes = ms.ToArray();