Fatal error: Uncaught Error: Call to undefined function add_action() in /home/ykraanet/public_html/wp-content/plugins/schema-and-structured-data-for-wp/admin_section/ajax-selectbox.php:2 Stack trace: #0 {main} thrown in /home/ykraanet/public_html/wp-content/plugins/schema-and-structured-data-for-wp/admin_section/ajax-selectbox.php on line 2