Fatal error: Uncaught Error: Call to undefined function add_action() in /wp-includes/functions.php:5250 Stack trace: #0 /wp-settings.php(81): require() #1 /wp-config.php(90): require_once('/wp-settings.ph...') #2 /wp-load.php(37): require_once('/wp-config.php') #3 /wp-blog-header.php(12): require_once('/wp-load.php') #4 /index.php(17): require('/wp-blog-header...') #5 {main} thrown in /wp-includes/functions.php on line 5250