Database Error. How to fix?

Question

MySQL

Hello.
When I try to access the site, I get this error

Error! mysql_connect('-', '-', '-')
Access denied for user 'пользователь'@'127.0.0.1' (using password: YES)
FILE: /home/users/p/пользователь/domains/домен/bitrix/modules/main/classes/mysql/main.php
LINE: 99
MySQL Query Error: SELECT L.*, L.LID as ID, L.LID as SITE_ID FROM b_lang L WHERE L.ACTIVE='Y' ORDER BY LENGTH(L.DIR) DESC, L.DOMAIN_LIMITED DESC, SORT []

DB query error.
Please try later.

What could be the problem ?
Thank you for your reply.