Ok, but your installation finished properly. Could you please try with this:
cd /path/to/your/letsencrypt./letsencrypt-auto certonly
I was having same issue and after struggling for many hours and looking for it on google and on bitnami docs, i was finally able to figure out how it is done. I have written an article for this on my site which has all the bits and pieces at one place. You can check it here How to enable let's encrypt ssl .
I'm glad to hear that you configured the application properly. Thank you for sharing this tutorial, it will be really helpful for a lot of users.
Thank you! This was a huge help. Saved me hours