Fatal error: Uncaught Error: Class "WP_REST_Controller" not found in /home/alladgbi/public_html/wp-content/plugins/simple-google-icalendar-widget/includes/RestController.php:22 Stack trace: #0 {main} thrown in /home/alladgbi/public_html/wp-content/plugins/simple-google-icalendar-widget/includes/RestController.php on line 22