Buggy Cake login code

<?php // Only for hightlighting

// Actions in controllers
////////////////////////////////////////////////////////////////////////////////
// In app controller
    function beforeFilter () {
        $this->Auth->loginAction = array (
            'controller' => 'users',
            'action' => 'login'
        );

        $this->Auth->autoRedirect = array (
            'controller' => 'users',
            'action' => 'dashboard'
        );

        $this->Auth->loginRedirect = array (
            'controller' => 'users',
            'action' => 'dashboard'
        );

        $this->Auth->logoutRedirect = array (
            'controller' => 'users',
            'action' => 'logout'
        );

        $this->Auth->loginError = "No t'has identificat correctament";
        $this->Auth->authError = "Has d'identificar-te com a usuari per accedir a aquesta secció";

        $this->Auth->actionPath = 'controllers/';

        $this->Auth->authorize = 'actions';
    }

// In users controller
    public function login () {
        $this->set ('title_for_layout', 'ARE · Gestió de Pràctiques externes');
        $this->set ('header_text', 'ARE · Gestió de Pràctiques externes');

        $userinfo = $this->Auth->user ();
        if ($userinfo) {
            if (substr($userinfo['User']['validate'], 0, 2) == 'v:') {
                $this->Auth->logout ();
                $this->redirect(array(
                    'controller' => 'users',
                    'action' => 'login'
                ));
            } else {
                $this->redirect(array(
                    'controller' => 'users',
                    'action' => 'dashboard'
                ));
            }
        } elseif (isset($this->data)) {
            if ($this->Auth->login($this->data) == 0) {
                $this->set ('cleanLogin', false);
            }
        } else {
            $this->set ('cleanLogin', true);
        }
    }

    public function dashboard () {
        $this->set ('title_for_layout', 'ARE · Panell de gestió');
        $this->set ('header_text', 'ARE · Panell de gestió');

        $userinfo = $this->Auth->user ();

        // The user have to be validated
        if (substr($userinfo['User']['validate'], 0, 2) == 'v:') {
            $this->Auth->logout ();
            $this->redirect(array(
                'controller' => 'users',
                'action' => 'login'
            ));
        }

        $groupid = $userinfo['User']['group_id'];
        $dashboard = $this->requestAction (
            array (
                'controller' => $this->group_numbers[$groupid],
                'action' => 'dashboard'
            ),
            array (
                'named' => array (),
                'pass' => array (),
                'return'
            )
        );

        $this->set('dashboard', $dashboard);
    }

// In companies controller (the specific user I'm trying represents a company
    public function dashboard () {
        $session = $this->Session;
        $user = $this->Auth->user ();

        if (!$session->check ('Role')) {
            $company = $this->Company->find (
                'first',
                array (
                    'conditions' => array (
                        'user_id' => $user['User']['id']
                    ),
                    'recursive' => -1
                )
            );

            $session->write ('Role', $company);
        }

        $this->set ('named', array ());
    }

?> // End of PHP block (for hightlighting)

// The users login view
////////////////////////////////////////////////////////////////////////////////
<form id="UserLoginForm" method="post" action="<?php echo $html->url(array ('controller' => 'users', 'action' => 'login')); ?>" accept-charset="utf-8">
    <div style="display:none;"><input type="hidden" name="_method" value="POST" /></div>
    <div id="login-box">
        <div class="input text login-field">
            <label for="UserUsername">Usuari: </label>
            <input name="data[User][username]" type="text" maxlength="32" id="UserUsername" />
        </div>
        <div class="input password login-field">
            <label for="UserPassword">Clau: </label>
            <input type="password" name="data[User][password]" id="UserPassword" />
        </div>
        <div class="submit login-button">
            <input type="submit" value="Entra" />
        </div>
        <div class="login-register">
        <?php
            echo $html->link (
                'Registri un usuari per a la seva empresa',
                array (
                    'controller' => 'companies',
                    'action' => 'create'
                )
            ).'<br/>';
            echo $html->link (
                'Registra\'t com a estudiant',
                array (
                    'controller' => 'students',
                    'action' => 'create'
                )
            ).'<br/>';
        ?>
        </div>
    </div>
    <?php if (!$cleanLogin): ?>
    <div class="login-error">No ha introduit les dades correctes</div>
    <?php endif;?>
</form>