开启memcached后报错，打不开网站

按照这篇https://blog.wpjam.com/article/wordpress-memcached/文章操作后打开网站就报错

Fatal error: Uncaught Error: Call to undefined function wpjam_doing_debug() in /www/wwwroot/xxx/wp-content/object-cache.php:4 Stack trace: #0 /www/wwwroot/xxx/wp-includes/load.php(547): require_once() #1 /www/wwwroot/ankylau.com/wp-settings.php(133): wp_start_object_cache() #2 /www/wwwroot/xxx/wp-config.php(88): require_once('/www/wwwroot/an...') #3 /www/wwwroot/xxx/wp-load.php(37): require_once('/www/wwwroot/an...') #4 /www/wwwroot/ankylau.com/wp-blog-header.php(13): require_once('/www/wwwroot/an...') #5 /www/wwwroot/xxx/index.php(17): require('/www/wwwroot/an...') #6 {main} thrown in /www/wwwroot/xxx/wp-content/object-cache.php on line 4
您的站点遇到了致命错误。