Fatal error: Uncaught Error: Call to undefined function add_action() in /var/www/publishing/wp-includes/functions.php:4480 Stack trace: #0 /var/www/publishing/wp-settings.php(72): require() #1 /var/www/publishing/wp-config.php(99): require_once('/var/www/publis...') #2 /var/www/publishing/wp-load.php(29): require_once('/var/www/publis...') #3 /var/www/publishing/wp-blog-header.php(12): require_once('/var/www/publis...') #4 /var/www/publishing/index.php(17): require('/var/www/publis...') #5 {main} thrown in /var/www/publishing/wp-includes/functions.php on line 4480