Hi,
I have mailchimp for wp (http://wordpress.org/plugins/mailchimp-for-wp/) installed and inserted in a page in avia layout builder in a widget area.
This is the error I get when I try to edit the page:
Call to undefined function mc4wp_get_form() in /…/public_html/wp-content/plugins/mailchimp-for-wp/includes/class-widget.php on line 42