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When executing HtmlConverter.Convert (FromURL) an error appears indicating: The index was out of range. It must be a non-negative value and less than the size of the collection.

The stack trace is:

System.ThrowHelper.ThrowArgumentOutOfRangeException (ExceptionArgument argument, ExceptionResource resource)

 in Syncfusion.Pdf.HtmlToPdf.HtmlToPdfResult.createPdfForms (PdfDocument lDoc)

 in Syncfusion.Pdf.HtmlToPdf.HtmlToPdfResult.RenderWebKit (PdfPageBase page, PdfLayoutFormat format)

 in Syncfusion.Pdf.HtmlToPdf.HtmlToPdfResult.Render (PdfPageBase page, PdfLayoutFormat format)

 in Syncfusion.HtmlConverter.HtmlToPdfConverter.Convert (String url)

FromURL =