why are these methods not called?

Module.php

<?php

namespace Passy;

use Zend\ModuleManager\ModuleManager,
    Zend\EventManager\StaticEventManager,
    Zend\Mvc\MvcEvent;

class Module
{
    public function init(ModuleManager $moduleManager)
    {
        $events = StaticEventManager::getInstance();
        $events->attach('bootstrap', 'bootstrap', array($this, 'initView'), 100);
        $events->attach('bootstrap', 'bootstrap', array($this, 'initRouter'), 200);
    }

    public function initView()
    {
        die('init view reached');
    }

    public function initRouter()
    {
        die('init router reached');
    }
}

This causes: Fatal error: Uncaught exception 'Zend\View\Exception\RuntimeException' with message 'Zend\View\Renderer\PhpRenderer::render: Unable to render template "404"; resolver could not resolve to a file' in library\Zend\View\Renderer\PhpRenderer.php on line 462