Why do I get a Fatal Error when I go to my page builder tab

1. Fatal error: Call to undefined function wp_enqueue_media() in /home/davesmob/public_html/insta/wp-content/plugins/aqua-page-builder/classes/class-aq-page-builder.php on line 119
2. Upgrade your WP version to 3.6.1 as the product doesn't work with the old version.  http://wordpress.org/support/topic/fatal-error-code-when-adding-product