Fatal error: Uncaught Error: Call to undefined function add_filter() in /home/workings/public_html/hidden/wp-content/plugins/jetpack/modules/theme-tools/content-options/featured-images.php:53 Stack trace: #0 {main} thrown in /home/workings/public_html/hidden/wp-content/plugins/jetpack/modules/theme-tools/content-options/featured-images.php on line 53