Variable "username" does not exist in HomeHomepageBundle:Template:header.html.twig
 at line 27

public function indexAction(Request $request)
    {
        $session = $this->getRequest()->getSession();
        $em = $this->getDoctrine()->getManager();
        $repository = $em->getRepository('LoginLoginBundle:Users');

        if ($request->getMethod() == 'POST') {
            $session->clear();
            $username = $request->get('username');
            $password = sha1($request->get('password'));
            $user = $repository->findOneBy(array(
                'username' => $username,
                'password' => $password));

            if ($user) {

                return $this->render('HomeHomepageBundle:Content:Dashboard.html.twig', array(

                    'username' => $user->getUsername() ,
                    'password' => $user->getPassword()));

            } else {
                return $this->render('LoginLoginBundle:Default:index.html.twig', array('username' => 'Username or Password Incorrect'));
                $em->persist($user);
                $em->flush();
            }
        } else
        return $this->render('LoginLoginBundle:Default:index.html.twig');

<span data-brackets-id='1813' class="hidden-xs">{{ username }}</span>

{% include 'HomeHomepageBundle:Template:header.html.twig' %}
    {% include 'HomeHomepageBundle:Template:leftpanel.html.twig' %}
    </aside>
    <div data-bracets-id='1869' class="content-wrapper">
   {% block content  %}{% endblock %}
        <section data-brackets-id='1878' class="content">
        </section>
    </div>
    {% include 'HomeHomepageBundle:Template:footer.html.twig' %}
    {% include 'HomeHomepageBundle:Template:rightpanel.html.twig' %}