Fatal error: Uncaught Error: Class 'WP_Upgrader' not found in /home/xovely/public_html/xovely/wp-admin/includes/class-language-pack-upgrader.php:19 Stack trace: #0 {main} thrown in /home/xovely/public_html/xovely/wp-admin/includes/class-language-pack-upgrader.php on line 19