How to config plugin HTML purifier

Plugins
1

I have trouble while config HTML purifier that was installed from github used composer below
$ composer require ezyang/htmlpurifier

next I called them from bootstrap.php

$this->addPlugin('ezyang/htmlpurifier');

and called them from src/Application.php

public function bootstrap()
   {
     parent::bootstrap();
     $this->addPlugin('ezyang/htmlpurifier');
   }

next I was try to config in method below this

use Cake\Event\Event;
use ArrayObject;

public function beforeMarshal(Event $event, ArrayObject $data, ArrayObject $options)
	{
	  foreach ($data as $key => $article) {
		 if(is_string($article)) {
		  $config = HTMLPurifier_Config::createDefault();
		  $purifier = new HTMLPurifier($config);
		  $clean_html = $purifier->purify($article);
		  $data[$key] = $clean_html;
		 }
	  }
	}

but the shown error display below

Error: The application is trying to load a file from the ezyang/htmlpurifier plugin.

Make sure your plugin ezyang/htmlpurifier is in the C:\xampp\htdocs\klinikucing\plugins\ directory and was loaded. 

<?php
// src/Application.php
public function bootstrap()
{
    parent::bootstrap();

    $this->addPlugin('ezyang/htmlpurifier');
}

How the way to make this plugin works, I hope someone help me, thanx

2

ezyang/htmlpurifier is not cakephp plugin.

You must autoload ezyang/htmlpurifier and or read this doc