Fatal error: Uncaught Error: Class "WP_Async_Request" not found in /usr/local/www/wordpress/wp-content/plugins/.old/sitepress-multilingual-cms/vendor/a5hleyrich/wp-background-processing/classes/wp-background-process.php:14 Stack trace: #0 {main} thrown in /usr/local/www/wordpress/wp-content/plugins/.old/sitepress-multilingual-cms/vendor/a5hleyrich/wp-background-processing/classes/wp-background-process.php on line 14