Fatal error: Uncaught Error: Call to undefined function add_action() in C:\xampp\htdocs\wp-config.php:19 Stack trace: #0 C:\xampp\htdocs\wp-load.php(50): require_once() #1 C:\xampp\htdocs\wp-blog-header.php(13): require_once('C:\\xampp\\htdocs...') #2 C:\xampp\htdocs\index.php(17): require('C:\\xampp\\htdocs...') #3 {main} thrown in C:\xampp\htdocs\wp-config.php on line 19