Fatal error: Uncaught Error: Class 'WP_Upgrader' not found in /home/xovely/public_html/xovely/wp-admin/includes/class-plugin-upgrader.php:21
Stack trace:
#0 {main}
thrown in /home/xovely/public_html/xovely/wp-admin/includes/class-plugin-upgrader.php on line 21