Phalcon 2 output flash with twig template – Twitter bootstrap

I’m using twig as the template engine, works good, but I’m having an issue outputing the flash messages there. none of these show anything.

{{ this.flash.output() }}

Only {{ content }} works, but it outputs notice and php warning messages as well.

This is how I set the flash

$di->set('flash', function () {
    $flash = new FlashDirect([
      //tie in with twitter bootstrap classes
      'error'     => 'alert alert-danger',
      'success'   => 'alert alert-success',
      'notice'    => 'alert alert-info',
      'warning'   => 'alert alert-warning'
    ]);

    return $flash;
});

This how I pass the messages to flash

$this->flash->error('Please use the link sent to you by email');

Any help would be appreciated.