Problem Generating Cert

I am working thru the steps located here: “https://www.digitalocean.com/community/tutorials/how-to-secure-nginx-with-let-s-encrypt-on-ubuntu-14-04” in order to setup letsencrypt for my nginx server. I am getting stuck when I run “./letsencrypt-auto certonly --standalone”

I end up getting a “ImportError: No module named warnings” Error and I am unsure why?
Any help would be appreciated
Chadd