The error message is coming from the sidebar form (Mailchimp plugin) not from Event Espresso.
I cannot see where the error is being fired from, so perhaps the best solution is to not show that widget on the registration page, either by using a plugin to change where widgets are displayed or changing the Event Registarion (or whatever the main registration page is called) to have no side bar, most themes support a full width page template and this can be done by editing the page itself http://codex.wordpress.org/Pages#Page_Templates
Thank you – it was the MailChimp widget in the sidebar.
Registration works now.
Thank you!
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