Fatal error: Uncaught Error: Class "WP_Upgrader_Skin" not found in /www/web_ecpol_php81/wp-admin/includes/class-language-pack-upgrader-skin.php:18
Stack trace:
#0 {main}
thrown in /www/web_ecpol_php81/wp-admin/includes/class-language-pack-upgrader-skin.php on line 18