title: CodeIgniter 3 Unable to locate the model you have specified
body: <p>I'm getting this error:</p>
  
  <pre><code>Unable to locate the model you have specified: Users_model
  </code></pre>
  
  <p>CodeIgniter is version 3. The filename is <code>Users_model.php</code>. It is located at <code>application\models</code> and it goes like this:</p>
  
  <pre><code>defined('BASEPATH') OR exit('No direct script access allowed');
  class Users_model extends CI_Model {
  
      public function __construct()
      {
          parent::__construct();
      }
  
  [...]
  }
  </code></pre>
  
  <p>I am calling it from a controller like this:</p>
  
  <pre><code>$this-&gt;load-&gt;model('users_model');
  </code></pre>
  
  <p>Interestingly enough, it works on a local mongoose server, but not when I deploy it to a heroku server.</p>