try2me on "[Plugin: MailChimp for WordPress] Required Field Error"

Hi, i've seted up mailchimp in wordpress and everything was going ok, since i've tryed to integrate MC with facebook, i don't know what happened but no i ve allways the message *please fill required field, and i've propetly configured the fields / merge settings and i've only the email seted up!...
Any clues
Thanks in advance!

https://wordpress.org/plugins/mailchimp-for-wp/