francescocuzzocrea on "No mailchimp lists found"

Hello, I have a free Mailchimp account and I have installed MailChimp List Subscribe Form plugin and I want to connect to Mailchimp. I have this message: "Uh-oh, you don't have any lists defined! Please visit MailChimp, login, and setup a list before using this tool!".
But I created a list in my Mailchimp Account. What's wrong? What do I have to do? Thank you very much.

http://wordpress.org/plugins/mailchimp/