ExpertPdf - Could not get conversion result header. Data receive error. Could not receive data. Error code: 109

I am using ExpertPdf *HtmlToPdf* library. When I try to AddElement to PdfPage I get an exception: "Could not get conversion result header. Data receive error. Could not receive data. Error code: 109". I have no idea why is that.

Code below:

PdfPage page = doc.Pages.AddNewPage();

HtmlToPdfElement htmlToPdfElement = new HtmlToPdfElement(0,0,0-1,"cos",null);

AddElementResult result = page.AddElement(htmlToPdfElement);