What I'm doing wrong here?

Interesting plugin and I hope learn how to use it for my website. I don’t understand why I have an error after clicking on the menus.
http://www.marilu.it/radio/

I have the following setting:

Ajax container ID:* content
Menu container class:* header
Search form TAG ID:* search

Thank you for your support! 🙂

http://wordpress.org/plugins/ajaxify-wordpress-site/