Quote Originally Posted by rnet View Post
PHP Warning: constant(): Couldn't find constant TABLE_SUBSCRIBERS in /var/www/html/includes/functions/audience.php on line 113
TABLE_SUBSCRIBERS is not part of a default Zen Cart install. It's something you added with an addon, presumably the "newsletter subscribe" addon. Inside that addon there has to be a file that defines TABLE_SUBSCRIBERS, and you need to have that file uploaded to your site in order for it to work. In fact, you probably need to do that for both the admin and non-admin sides of your site. So, go back and double check all the installation steps for that addon and make sure you've not missed anything or haven't broken something during your upgrade by wiping out one or more of its changes when replacing files.