Fatal error: Class "Hybridauth\\Hybridauth\\Provider\\Telegram" not found

[Mo45]

Hello there. Trying to use new (to me) v3.8.2. But can't use it with Telegram provider.

PHP Fatal error: Uncaught Error: Class "Hybridauth\\Hybridauth\\Provider\\Telegram" not found in /var/some/www/index.php:20\nStack trace:\n#0 {main}\n thrown in /var/some/www/index.php on line 20

In index.php i have these:

include_once( dirname( __FILE__ ) . '/hybridauth/autoload.php' );

use Hybridauth\Hybridauth;
use Hybridauth\HttpClient;
$config = ['callback' => HttpClient\Util::getCurrentUrl(),'keys' => ['id' => 'mybot', 'secret' => '123:somesecret'],];

$adapter = new Hybridauth\Provider\Telegram($config);
try {
$adapter->authenticate();
$userProfile = $adapter->getUserProfile();
} catch (\Exception $e) {
print $e->getMessage();
}

PHP Version 8.1.6

Also, i've have same error with HttpClient:
Uncaught Error: Class "Hybridauth\\Hybridauth\\HttpClient\\Util" not found
But when i changed this line:
'callback' => Hybridauth\HttpClient\Util::getCurrentUrl(),
to
'callback' => HttpClient\Util::getCurrentUrl(),
error disappear.

[Mo45]

Fixed by adding slash before Hybridauth\Provider\Telegram($config);
In this line: $adapter = new \Hybridauth\Provider\Telegram($config);
Is this documentaion mistake or something wrong with my environment?

[RiverVanRain]

This is a misuse of PHP.
Please learn more on Namespace