Fatal error: Uncaught Error: Class 'WP_Widget_Media' not found in /export/sd05/www/jp/r/e/gmoserver/7/0/sd0060170/pc-fujise.com/onlinef/wordpress-5.8.0-ja-jetpack_webfont-undernavicontrol/wp-includes/widgets/class-wp-widget-media-audio.php:18 Stack trace: #0 /export/sd05/www/jp/r/e/gmoserver/7/0/sd0060170/pc-fujise.com/onlinef/wordpress-5.8.0-ja-jetpack_webfont-undernavicontrol/wp-includes/default-widgets.php(26): require_once() #1 /export/sd05/www/jp/r/e/gmoserver/7/0/sd0060170/pc-fujise.com/onlinef/wordpress-5.8.0-ja-jetpack_webfont-undernavicontrol/wp-includes/functions.php(5179): require_once('/export/sd05/ww...') #2 /export/sd05/www/jp/r/e/gmoserver/7/0/sd0060170/pc-fujise.com/onlinef/wordpress-5.8.0-ja-jetpack_webfont-undernavicontrol/wp-includes/class-wp-hook.php(307): wp_maybe_load_widgets('') #3 /export/sd05/www/jp/r/e/gmoserver/7/0/sd0060170/pc-fujise.com/onlinef/wordpress-5.8.0-ja-jetpack_webfont-undernavicontrol/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters('', Array) #4 /export/sd05/www/jp/r/e/gm in /export/sd05/www/jp/r/e/gmoserver/7/0/sd0060170/pc-fujise.com/onlinef/wordpress-5.8.0-ja-jetpack_webfont-undernavicontrol/wp-includes/widgets/class-wp-widget-media-audio.php on line 18