In order for the AutoCompleteZon to function properly your theme footer.php must have this tag:
<?php wp_footer(); ?>

This tag is very important for the wordpress site. All themes must have it in their footer.php just before the closing </body> tag or else it breaks many plugins.

How To Fix

1. In your wordpress admin panel go to Appearance -> Editor and click on footer.php in the list of files on the right.
2. Find </body> tag and right before it copy and paste this:
   <?php wp_footer();  ?>

Note: Backup your files before making this change. If you have any firewall plugins disable them before making changes.

If you would like to learn why it is important to have <?php wp_footer(); ?> tag in your theme check function reference here.

Posted in: Common Support Questions, Settings