Fatal error: Uncaught Error: Call to undefined function add_action() in /home/sfeednon/public_html/wp-content/plugins/schema-and-structured-data-for-wp/admin_section/plugin-installer/install.php:16 Stack trace: #0 {main} thrown in /home/sfeednon/public_html/wp-content/plugins/schema-and-structured-data-for-wp/admin_section/plugin-installer/install.php on line 16