nextcloud-server/lib/private/user/nouserexception.php

<?php
/**
 * ownCloud
 *
 * This file is licensed under the Affero General Public License version 3 or
 * later. See the COPYING-AGPL file.
 *
 * @author Jörn Friedrich Dreyer <jfd@owncloud.com>
 * @copyright Jörn Friedrich Dreyer 2015
 */

namespace OC\User;

class NoUserException extends \Exception {}