Fatal error: Uncaught Error: Class 'WP_Upgrader_Skin' not found in /www/wwwroot/mk-sports.app/wp-admin/includes/class-theme-upgrader-skin.php:18 Stack trace: #0 {main} thrown in /www/wwwroot/mk-sports.app/wp-admin/includes/class-theme-upgrader-skin.php on line 18