Fatal error: Uncaught Error: Call to undefined function add_action() in /home/romeston/prueba.idelive.com/wp-content/plugins/menu-icons/vendor/codeinwp/menu-item-custom-fields/doc/menu-item-custom-fields-example.php:46 Stack trace: #0 /home/romeston/prueba.idelive.com/wp-content/plugins/menu-icons/vendor/codeinwp/menu-item-custom-fields/doc/menu-item-custom-fields-example.php(138): Menu_Item_Custom_Fields_Example::init() #1 {main} thrown in /home/romeston/prueba.idelive.com/wp-content/plugins/menu-icons/vendor/codeinwp/menu-item-custom-fields/doc/menu-item-custom-fields-example.php on line 46