Error With Dotenv When Previewing

I have been following along with the videos up until this point. When I try previewing I get the following error. Not sure where the issue is.

Notice: Use of undefined constant Dotenv - assumed 'Dotenv' in /home/treehouse/workspace/inc/settings.php on line 2

Fatal error: Uncaught Error: Class 'Dotenv' not found in /home/treehouse/workspace/inc/settings.php:2 Stack trace: #0 /home/treehouse/workspace/inc/bootstrap.php(6): require_once() #1 /home/treehouse/workspace/index.php(2): require_once('/home/treehouse...') #2 {main} thrown in /home/treehouse/workspace/inc/settings.php on line 2

''' <?php $dotenv = Dotenv/Dotenv::create(DIR); $dotenv->load();

/*

• Handle Exceptions */ function exception_handler($e) { die($e->getMessage()); } set_exception_handler("exception_handler");

/*

• Set up database connection */ try { $db = new PDO( 'sqlite:'.DIR.'/database.db' ); $db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); $db->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC); } catch ( \Exception $e ) { echo 'Error connecting to the Database: ' . $e->getMessage(); exit; }

/*

• Set access to components from \Symfony\Component\HttpFoundation\
• 1. Session
• 2. Request
• 3. Redirect */

// 1. session \Symfony\Component\HttpFoundation\Session $session = new \Symfony\Component\HttpFoundation\Session\Session(); $session->start();

// 2. request \Symfony\Component\HttpFoundation\Request function request() { return \Symfony\Component\HttpFoundation\Request::createFromGlobals(); }

// 3. redirect \Symfony\Component\HttpFoundation\Response function redirect($path, $extra = []) { $response = \Symfony\Component\HttpFoundation\Response::create(null, \Symfony\Component\HttpFoundation\Response::HTTP_FOUND, ['Location' => $path]); if (key_exists('cookies', $extra)) { foreach ($extra['cookies'] as $cookie) { $response->headers->setCookie($cookie); } } $response->send(); exit; } '''