Fatal error: Uncaught Error: Call to undefined function Automattic\Jetpack\Assets\wp_is_serving_rest_request() in /var/www/vhosts/cronacaflegrea.it/httpdocs/wp-content/plugins/jetpack-social/jetpack_vendor/automattic/jetpack-assets/src/class-script-data.php:113 Stack trace: #0 /var/www/vhosts/cronacaflegrea.it/httpdocs/wp-content/plugins/jetpack-social/jetpack_vendor/automattic/jetpack-assets/src/class-script-data.php(88): Automattic\Jetpack\Assets\Script_Data::is_authenticated_rest_request() #1 /var/www/vhosts/cronacaflegrea.it/httpdocs/wp-includes/class-wp-hook.php(308): Automattic\Jetpack\Assets\Script_Data::render_script_data() #2 /var/www/vhosts/cronacaflegrea.it/httpdocs/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters() #3 /var/www/vhosts/cronacaflegrea.it/httpdocs/wp-includes/plugin.php(517): WP_Hook->do_action() #4 /var/www/vhosts/cronacaflegrea.it/httpdocs/wp-includes/script-loader.php(2132): do_action() #5 /var/www/vhosts/cronacaflegrea.it/httpdocs/wp-includes/class-wp-hook.php(308): wp_print_head_scripts() #6 /var/www/vhosts/cronacaflegrea.it/httpdocs/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters() #7 /var/www/vhosts/cronacaflegrea.it/httpdocs/wp-includes/plugin.php(517): WP_Hook->do_action() #8 /var/www/vhosts/cronacaflegrea.it/httpdocs/wp-includes/general-template.php(3043): do_action() #9 /var/www/vhosts/cronacaflegrea.it/httpdocs/wp-content/themes/Cronaca-Flegrea-News/header.php(21): wp_head() #10 /var/www/vhosts/cronacaflegrea.it/httpdocs/wp-includes/template.php(783): require_once('...') #11 /var/www/vhosts/cronacaflegrea.it/httpdocs/wp-includes/template.php(718): load_template() #12 /var/www/vhosts/cronacaflegrea.it/httpdocs/wp-includes/general-template.php(48): locate_template() #13 /var/www/vhosts/cronacaflegrea.it/httpdocs/wp-content/themes/Cronaca-Flegrea-News/single.php(10): get_header() #14 /var/www/vhosts/cronacaflegrea.it/httpdocs/wp-includes/template-loader.php(113): include('...') #15 /var/www/vhosts/cronacaflegrea.it/httpdocs/wp-blog-header.php(19): require_once('...') #16 /var/www/vhosts/cronacaflegrea.it/httpdocs/index.php(17): require('...') #17 {main} thrown in /var/www/vhosts/cronacaflegrea.it/httpdocs/wp-content/plugins/jetpack-social/jetpack_vendor/automattic/jetpack-assets/src/class-script-data.php on line 113