CI-Neo4jPHP, getting labels from a node

Question

This script below writen in CI and Neo4jPHP environment.

    $client = new Everyman\Neo4j\Client("localhost", 7474);
    $client->getTransport()->setAuth("admin","password");

    $all_labels = $client->getLabels();
    foreach ($all_labels as $key=>$a_label)
    {
        echo $key.": ".$a_label->getName()."\n";
    }

List of labels expected, but i didn't get anything.