Why is my Drupal 8 module show Page not found?
<p>I'm following the <a href="https://knpuniversity.com/screencast/drupal8-under-the-hood/modules-routes-controllers#play" rel="nofollow noreferrer">Modules, Routes and Controllers</a> tutorial. However, I kept getting "Page not found" regardless of "Clear all cache".</p>

<p>dino_roar.info.yml file:</p>

<pre><code>name: Dino ROAR
type: module
description: "ROAR at you"
package: Custom
core: 8.x
</code></pre>

<p>dino_roar.routing.yml</p>

<pre><code>dino_says:
  path: /the/dino/says/
  defaults:
    _controller: Drupal\dino_roar\Controller\RoarController::roar
  requirements:
    _permission: 'access content'
</code></pre>

<p>and src/Controller/RoarController.php file:</p>

<pre><code>&lt;?php

namespace Drupal\dino_roar\Controller;
use Symfony\Component\HttpFoundation\Response;

class RoarController
{
    public function roar(){
        return new Response('ROOOOAR');
    }
}
</code></pre>

<p>When accessing through: <a href="http://drupal-8.dd:8083/the/dino/says/" rel="nofollow noreferrer">http://drupal-8.dd:8083/the/dino/says/</a> I get the page not found error. Any suggestion is much appreciated.</p>

<p>Below is my folder structure:
<a href="https://i.stack.imgur.com/xVg9y.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/xVg9y.png" alt="enter image description here"></a></p>

<p>And this is what it looks when I collapsed the src folder.
<a href="https://i.stack.imgur.com/KtYdU.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/KtYdU.png" alt="enter image description here"></a></p>