Fatal error: Uncaught Error: Call to undefined function add_action() in /home/artemi19/public_html/test/wp-content/plugins/jetpack/modules/custom-css/custom-css.php:1627 Stack trace: #0 {main} thrown in /home/artemi19/public_html/test/wp-content/plugins/jetpack/modules/custom-css/custom-css.php on line 1627