Fatal error: Uncaught Error: Call to undefined function Automattic\Jetpack\Classic_Theme_Helper\add_action() in /home/occhiodifm/www/wp-content/plugins/jetpack/jetpack_vendor/automattic/jetpack-classic-theme-helper/src/class-main.php:41 Stack trace: #0 /home/occhiodifm/www/wp-content/plugins/jetpack/jetpack_vendor/automattic/jetpack-classic-theme-helper/src/class-main.php(127): Automattic\Jetpack\Classic_Theme_Helper\Main::init() #1 {main} thrown in /home/occhiodifm/www/wp-content/plugins/jetpack/jetpack_vendor/automattic/jetpack-classic-theme-helper/src/class-main.php on line 41