Mysql error dibagian sandi?

Warning: mysqli_connect(): (HY000/1045): Access denied for user 'root'@'localhost' (using password: YES) in C:\xampp\htdocs\testt\msql.php on line 3
ada errorAccess denied for user 'root'@'localhost' (using password: YES)

Di settingan xampp default dan tidak ada yang diganti.

kode di php:

<?php

$link = mysqli_connect('localhost', 'root', 'root', 'mahasiswa');
if(!$link){
    die('ada error'. mysqli_connect_error());
}

?>