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