I just had the same problem.
For me, it was the because I have changed the “name” attribute of the “email input” tag.
You have to make sure, the name is “ne” (or like in the javascript function associated).
I tried to suscribe on your newsletter and I don’t find any javascript error. Did you change something in the newsletter source code ?
Could you try with another theme like twenty ?
Hope it’ll help you !
