wp_enqueue_script error evoked by this plugin

When Mandatory Field is active and i have debugging on in WP i get this error which goes away upon deactivation of this plugin.

wp_enqueue_script was called incorrectly. Scripts and styles should not be registered or enqueued until the wp_enqueue_scripts, admin_enqueue_scripts, or login_enqueue_scripts hooks.

http://ww.wp.xz.cn/plugins/mandatory-fields/