Installation problems.

Hello,
When trying to install Maian Greetings, all I get is a red band on top saying "Database Error. Check software log for more details.".
I did everything as in the instructions and here is the log file:
"Date/Time: 3 December 2023 @ 05:46:57
Code: 2002
Error: php_network_getaddresses: getaddrinfo failed: Name or service not known
File: /home/mv44motk/vlaamseradio.co.uk/greetings/control/classes/system/class.db.php
Line: 502"
And here is _cfg.php:
"<?php

/*----------------------------------------------------------------------------------
  SAMPLE CONFIG FILE:
  Rename or copy this file as '_cfg.php'.
 
  EDIT VALUES ON THE RIGHT, DO NOT CHANGE THE VALUES IN CAPITALS!!!
------------------------------------------------------------------------------------*/

/* DATABASE CONNECTION
   If you are unsure of your database credentials, contact your host
----------------------------------------------------------------------*/

/* MySQL host */
define('localhost', 'Your host name goes here');

/* MySQL username */
define('mv44motk_kaarter', 'Your username goes here');

/* MySQL password */
define('************8', 'Your password goes here');

/* MySQL database name */
define('mv44motk_kaarten', 'Your database name goes here');

/* Table prefix. You can have multiple installations in one database if you give each
   a unique prefix. Only numbers, letters, and underscores
*/
define('DB_PREFIX', 'mgr_');

/* Charset used to create database tables. If unsure, don't change. */
define('DB_CHAR_SET', 'utf8');

/* MySQL locale. If unsure, don't change.
   http://dev.mysql.com/doc/refman/5.0/en/locale-support.html
*/
define('DB_LOCALE', 'en_GB');

/* MySQL date/time adjustment. You can also use 'system'. May not need changing. */
define('DB_TIMEZONE', '+00:00');


/* ADMIN LOGIN
   Make sure your details are secure and hard to guess
-------------------------------------------------------------*/

/* Admin login username */
define('Admino', 'Your login username goes here');

/* Admin login password */
define('************', 'Your login password goes here');

/* Optional. Enter IP addresses (comma delimited) for IP restriction on login */
define('LG_RESTRICT_BY_IP', '');


/* SECURITY SALT / HASH
   Random mix of alphanumeric and special characters to encrypt session/cookie data.
   Generate hash @ https://www.maianmedia.com/services/keys/
-----------------------------------------------------------------------------------------*/

define('(5}sc9vDb6oPLB4QMCad!AeS<W#Y*mI,xq)$80OpXRw>%yr:&1KJhG;2TU^fF+@EVHjgu-il3znZ7t[.k_N', 'Your secret key value goes here');

?>"
If more information is required, please ask.
Thanks in advance.