Need help with 2008 r2 certificate


I wish to create 2 certificates for my 2 HTTPS sites.

I'm using letsencrypt-win-simple since i'm on Windows Server 2008 r2 using IIS.

When i run the program, either As administrator or just by running it, i get this "error"

Scanning IIS 7 Site Bindings for Hosts
No IIS bindings with host names were found. Please add one using IIS Manager.
A host name and site path are required to verify domain ownership.
No targets found.

I tried in IIS to use the guide for Create certificate request, but that didn't do the trick.

What am i doing wrong?