title: RuntimeException in Laravel 5.3
body: <p>I've just installed Laravel 5.3. <code>php artisan serv</code> also runs. </p>
  
  <p>But as I hit <code>http://localhost:8000/</code> on browser I get a <code>RuntimeException</code>.</p>
  
  <p><a href="https://i.stack.imgur.com/K4Mhu.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/K4Mhu.png" alt="Error"></a></p>
  
  <p>Is there any solution to prevent this error? </p>