FosCommentBundle assetic exception to Symfony3 - php-7

Question

I'm trying to use FosCommentBundle to Symfony3.
I complete all steps for installation with documentation of bundle.
I add AppKernel infos and created database, updated schemas and added Jquery3.
But when i try to check index.html.twig it gives following error.
There is no extension able to load the configuration for "assetic" (in C:\xampp\htdocs\blogbundle\app/config\config.yml). Looked for namespace "assetic", found "framework", "security", "twig", "monolog", "swiftmailer", "doctrine", "sensio_framework_extra", "fos_rest", "fos_comment", "jms_serializer", "debug", "web_profiler", "sensio_distribution", "web_server" in C:\xampp\htdocs\blogbundle\app/config\config.yml (which is being imported from "C:\xampp\htdocs\blogbundle\app/config/config_dev.yml").
my config.yml
fos_comment:
db_driver: orm
class:
model:
comment: AppBundle\Entity\Comment
thread: AppBundle\Entity\Thread
assetic:
bundles: [ "FOSCommentBundle" ]
routing.yml
app:
resource: '#AppBundle/Controller/'
type: annotation
fos_comment_api:
type: rest
resource: "#FOSCommentBundle/Resources/config/routing.yml"
prefix: /api
defaults: { _format: html }
Entities:
- Comment.php
<?php
namespace AppBundle\Entity;
use Doctrine\ORM\Mapping as ORM;
use FOS\CommentBundle\Entity\Comment as BaseComment;
/**
* #ORM\Entity
* #ORM\ChangeTrackingPolicy("DEFERRED_EXPLICIT")
*/
class Comment extends BaseComment
{
/**
* #ORM\Id
* #ORM\Column(type="integer")
* #ORM\GeneratedValue(strategy="AUTO")
*/
protected $id;
/**
* Thread of this comment
*
* #var Thread
* #ORM\ManyToOne(targetEntity="AppBundle\Entity\Thread")
*/
protected $thread;
}
Thread.php
<?php
namespace AppBundle\Entity;
use Doctrine\ORM\Mapping as ORM;
use FOS\CommentBundle\Entity\Thread as BaseThread;
/**
* #ORM\Entity
* #ORM\ChangeTrackingPolicy("DEFERRED_EXPLICIT")
*/
class Thread extends BaseThread
{
/**
* #var string $id
*
* #ORM\Id
* #ORM\Column(type="string")
*/
protected $id;
}

Answer 1

All you have to do is to install the assetic bundle.
composer requires symfony/assetic-bundle
and then add this to registerBundles in appkernel
new Symfony\Bundle\AsseticBundle\AsseticBundle(),
and add this to config.yml
assetic:
debug: '%kernel.debug%'
use_controller: '%kernel.debug%'
filters:
cssrewrite: ~