I am getting this error when i try to download the PDF. Is this related to the OS of the server or the client machine which was trying to download the PDF.

Hi Mathavan,

From that message alone, I'd say this is likely related to the executable for the HtmlToPDFConverter that is for the wrong operating system (32-bit vs. 64-bit or Windows vs. Linux). HtmlToPdfConverter has an Administration page that allows you to upload to the server the binaries/executables it will use to generate PDFs/images, make sure you chose the right ones for the server's operating system.