The feed does not have subscriptions by email enabled

I could not post this in the thread from 2 years ago. I was having this issue even though I had activated it in feedburner.

Where it asks for Feedburner Feed URL : http://feeds.feedburner.com/YOURFEEDURL

Just put: YOURFEEDURL

You will stop getting the error message. I hope this helps someone else from an hour of searching for an answer. 🙂

http://wordpress.org/plugins/feedburner-email-widget/