[NSFW] cannot login

i cant login to my site, after ive activated wo_debug, these messages showed up

Fatal error: Cannot redeclare retrieve_password() (previously declared in /var/www/html/wp-login.php:336) in /var/www/html/wp-includes/user.php on line 3047

i dont know what happening here, can someone help me what to do to fix my wp site?tkx^

The page I need help with: [log in to see the link]