Cannot add HTML2PDF.dll to Visual Studio project

Q:

Please help with this issue. When I try to add the reference of html2pdf.dll in Visual Studio 2012, I am getting below error message. I am not sure why. Any help would be highly appreciated.

"A Reference to ‘{file_path}/html2pdf.dll’ could not be added. Please make sure that the file is accessible, and this is as valid assembly or COM component.

A:

Please see the readme.txt file included with the html2pdf module archive.

You cannot load the module at compile time.

Instead call it at runtime using HTML2PDF.SetModulePath().

Also see the HTML2PDFTest C# code.
http://www.pdftron.com/pdfnet/samplecode/Html2PdfTest.cs.html