Fatal error message upon clicking settings

When I click on settings on the actual plug in, I get this:

Fatal error: Call to undefined function wp_enqueue_media() in /websites/123reg/LinuxPackage21/in/te/ri/interiorme.co.uk/public_html/wp-content/plugins/yith-maintenance-mode/yit-common/yith-panel.phpon line 312

Any thoughts?

Regards

Toni

http://wordpress.org/plugins/yith-maintenance-mode/