Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, class "Automattic\Jetpack\Extensions\Contact_Form\Contact_Form_Block" not found in /customers/e/c/8/personal-assistant.it/httpd.www/w8/wp-includes/class-wp-hook.php:308 Stack trace: #0 /customers/e/c/8/personal-assistant.it/httpd.www/w8/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters(Object(Jetpack_Keyring_Service_Helper), Array) #1 /customers/e/c/8/personal-assistant.it/httpd.www/w8/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #2 /customers/e/c/8/personal-assistant.it/httpd.www/w8/wp-settings.php(623): do_action('init') #3 /customers/e/c/8/personal-assistant.it/httpd.www/w8/wp-config.php(132): require_once('/customers/e/c/...') #4 /customers/e/c/8/personal-assistant.it/httpd.www/w8/wp-load.php(50): require_once('/customers/e/c/...') #5 /customers/e/c/8/personal-assistant.it/httpd.www/w8/wp-blog-header.php(13): require_once('/customers/e/c/...') #6 /customers/e/c/8/personal-assistant.it/httpd.www/w8/index.php(17): require('/customers/e/c/...') #7 {main} thrown in /customers/e/c/8/personal-assistant.it/httpd.www/w8/wp-includes/class-wp-hook.php on line 308