Thanks to ChatGPT I got my issue resolved. For anyone who has this issue in the future, you need to amend you config files as follows:
1/ includes/configure.php
<?php
// set the level of error reporting
error_reporting(E_ALL);
const HTTP_SERVER = '
http://localhost';
const DIR_WS_CATALOG = '/phoenix/';
const COOKIE_OPTIONS = [
'lifetime' => 0,
'domain' => '',
'path' => '/',
'samesite' => 'Lax',
];
// filesystem path (NOT URL)
const DIR_FS_CATALOG = 'D:/UniServer/www/phoenix/';
date_default_timezone_set('Europe/London');
// database
const DB_SERVER = 'localhost';
const DB_SERVER_USERNAME = 'root';
const DB_SERVER_PASSWORD = 'root';
const DB_DATABASE = 'phoenix';
2. admin/includes/configure.php
<?php
// set the level of error reporting
error_reporting(E_ALL);
const HTTP_SERVER = '
http://localhost';
const HTTPS_SERVER = '
http://localhost';
const ENABLE_SSL = false;
const DIR_WS_ADMIN = '/phoenix/admin/';
const DIR_WS_CATALOG = '/phoenix/';
const COOKIE_OPTIONS = [
'lifetime' => 0,
'domain' => '',
'path' => '/',
'samesite' => 'Lax',
];
const DIR_FS_DOCUMENT_ROOT = 'D:/UniServer/www/phoenix/';
const DIR_FS_ADMIN = 'D:/UniServer/www/phoenix/admin/';
const DIR_FS_BACKUP = 'D:/UniServer/www/phoenix/admin/backups/';
const DIR_FS_CATALOG = 'D:/UniServer/www/phoenix/';
const HTTP_CATALOG_SERVER = '
http://localhost';
date_default_timezone_set('Europe/London');
// database
const DB_SERVER = 'localhost';
const DB_SERVER_USERNAME = 'root';
const DB_SERVER_PASSWORD = 'root';
const DB_DATABASE = 'phoenix';
That's all ..............