Problem with Authentication

IndexController.php

<?php
/**
 * Zend Framework (http://framework.zend.com/)
 *
 * @link      http://github.com/zendframework/ZendSkeletonApplication for the canonical source repository
 * @copyright Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)
 * @license   http://framework.zend.com/license/new-bsd New BSD License
 */

namespace Application\Controller;

use Zend\Mvc\Controller\AbstractActionController;
use Zend\View\Model\ViewModel;
use Zend\Authentication\AuthenticationService;
use Zend\Authentication\Storage\Session as SessionStorage;
use Zend\Authentication\Adapter\DbTable as AuthAdapter;
use Zend\Db\Adapter as DbAdapter;

class IndexController extends AbstractActionController
{
    public function indexAction()
    {
        return new ViewModel();
    }

    public function loginAction()
    {
        $email = 'test';//$this->getRequest()->getMetadata('email');
        $password = 'password';//$this->getRequest()->getMetadata('password');

        $auth = new AuthenticationService();
        $auth->setStorage(new SessionStorage());
        $sm = $this->getServiceLocator();
        $dbAdapter = $sm->get('Zend\Db\Adapter\Adapter'); // Giving me: Zend\ServiceManager\ServiceManager::get was unable to fetch or create an instance for Zend\Db\Adapter\Adapter
        $authAdapter = new AuthAdapter($dbAdapter);
        $authAdapter->setTableName('accounts')
            ->setIdentityColumn('email')
            ->setCredentialColumn('password')
            ->setIdentity($email)
            ->setCredential($password);

        $select = $authAdapter->getDbSelect();
        $select->where('status != "deleted"');

        $result = $auth->authenticate($authAdapter);
        var_dump($result);
    }
}