Después de cambiar parte del código de 1.3 a 2.1. Algún error ocurre. Este es el error:

Missing Plugin
Error: The application is trying to load a file from the forums plugin
Error: Make sure your plugin forums is in the app\Plugin directory and was loaded

<?php
CakePlugin::load('forums');

Loading all plugins: If you wish to load all plugins at once, use the following line in your app\Config\bootstrap.php file

CakePlugin::loadAll();
Notice: If you want to customize this error message, create app\View\Errors\missing_plugin.ctp.

Alguien, por favor, ¿me ayudas?