Fatal error: Uncaught mysqli_sql_exception

[Delayito]

i can't entry to localhost by this error:

Fatal error: Uncaught mysqli_sql_exception: No se puede establecer una conexión ya que el equipo de destino denegó expresamente dicha conexión in C:\xampp\htdocs\wp-includes\wp-db.php:1656 Stack trace: #0 C:\xampp\htdocs\wp-includes\wp-db.php(1656): mysqli_real_connect(Object(mysqli), 'localhost', 'root', '', NULL, NULL, NULL, 0) #1 C:\xampp\htdocs\wp-includes\wp-db.php(632): wpdb->db_connect() #2 C:\xampp\htdocs\wp-includes\load.php(558): wpdb->__construct('root', '', 'wordpress', 'localhost') #3 C:\xampp\htdocs\wp-settings.php(124): require_wp_db() #4 C:\xampp\htdocs\wp-config.php(96): require_once('C:\\xampp\\htdocs...') #5 C:\xampp\htdocs\wp-load.php(50): require_once('C:\\xampp\\htdocs...') #6 C:\xampp\htdocs\wp-blog-header.php(13): require_once('C:\\xampp\\htdocs...') #7 C:\xampp\htdocs\index.php(17): require('C:\\xampp\\htdocs...') #8 {main} thrown in C:\xampp\htdocs\wp-includes\wp-db.php on line 1656

There has been a critical error on this website.

anyone can help me?:(