Fatal error: Uncaught Error: Call to undefined function add_action() in /var/www/Nielsen/public_html/wp-content/plugins/jetpack/modules/custom-css/custom-css.php:26 Stack trace: #0 /var/www/Nielsen/public_html/wp-content/plugins/jetpack/modules/custom-css/custom-css.php(1324): Jetpack_Custom_CSS_Enhancements::add_hooks() #1 {main} thrown in /var/www/Nielsen/public_html/wp-content/plugins/jetpack/modules/custom-css/custom-css.php on line 26