Warning: require_once(/home/www/client/www/wp-admin/includes/class-wp-list-table.php): failed to open stream: No such file or directory in /home/www/client/www/wp-content/plugins/mailin/inc/table-forms.php on line 6

Fatal error: require_once(): Failed opening required '/home/www/client/www/wp-admin/includes/class-wp-list-table.php' (include_path='.:/usr/lib64/php-7.3/php') in /home/www/client/www/wp-content/plugins/mailin/inc/table-forms.php on line 6