Fatal error: Uncaught Error: Call to undefined function add_action() in C:\xampp\htdocs\wp-content\plugins\advanced-custom-fields\includes\forms\form-taxonomy.php:33 Stack trace: #0 C:\xampp\htdocs\wp-content\plugins\advanced-custom-fields\includes\forms\form-taxonomy.php(372): acf_form_taxonomy->__construct() #1 {main} thrown in C:\xampp\htdocs\wp-content\plugins\advanced-custom-fields\includes\forms\form-taxonomy.php on line 33