Fatal error: Uncaught Error: Call to undefined function add_action() in /home/antenaserwis/public_html/satserwis/wp-content/plugins/jetpack/modules/custom-css/custom-css.php:24 Stack trace: #0 /home/antenaserwis/public_html/satserwis/wp-content/plugins/jetpack/modules/custom-css/custom-css.php(1160): Jetpack_Custom_CSS_Enhancements::add_hooks() #1 {main} thrown in /home/antenaserwis/public_html/satserwis/wp-content/plugins/jetpack/modules/custom-css/custom-css.php on line 24