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RESOLVED !
Hello everyone, I started to use FuelPHP, and it's really an amazing framework in my opionion.
But I got a problem, my first problem. It happens both in Controller_Template and Controller classes. So, I got a normal controller with after() and before() methods. The problem is that an error happens :

Fuel\Core\FuelException [ Error ]: Controller_Admin::action_login() or the controller after() method must return a Response object.

My before() method contains, at the beggining, parent::before(); Same for my after() method (parent::after($response)). Now, I don't know what I can do to correct this... Here is the full code :

<?php

/**
 * The Admin Controller.
 *
 * Controller of the whole admin
 * 
 * @package  app
 * @extends  Controller
 */
class Controller_Admin extends Controller_Template
{

 public $template = 'admin/_layout';

 public $title = 'Administration de QMCE';
 public $data = array();

 /**
  * Before : Check authentification
  * 
  * @access  public
  * @return  Response
  */
 public function before()
 {
  parent::before();

  //Check authentification

  $auth = Auth::instance();

  if (Request::active()->action != 'login')
  {
   if(Auth::check())
   {
    if(!$auth->member('100'))
    {
     Session::set_flash('information', '<b>Information :</b> Ce formulaire vous deconnectera de votre compte actuel.');
     Response::redirect('admin/login');
    }
   }
   else
   {
    Response::redirect('admin/login');
   }
  }

  if (Request::active()->action == 'login')
  {
   if(Auth::check())
   {
    if($auth->member('100'))
    {
     $auth->logout();
     Session::set_flash('informationLogin', '<b>Information :</b> Vous etiez deja connecte en tant qu\'admin, vous avez ete deconnecte.');
    }
    else
    {
     $auth->logout();
     Session::set_flash('informationLogin', '<b>Information :</b> Vous etiez deja connecte en tant que non admin, vous avez ete deconnecte.');
    }
   }
  }

  if(Auth::check() AND $auth->member('100'))
  {
   $this->template->set_global('loggedIn', $auth->get_screen_name());
  }
  else
  {
   $this->template->set_global('loggedIn', false);
  }
 }

 public function after($response)
 {
  parent::after($response);

  //Set views infos

        $this->template->title = $this->title;

  $chemin = Uri::string();
  if(Request::active()->action == 'index') //If it's the index
  {
   $segments = Uri::segments();
   if(end($segments) != 'index')
   {
    $chemin .= '/index';
   }
  }
        $this->template->content = View::forge($chemin, $this->data);

        return $response;
 }

 /**
  * Index page : Show panel
  * 
  * @access  public
  * @return  Response
  */
 public function action_index()
 {
  $this->title .= ' > Accueil';
 }

 /**
  * Login method
  * 
  * @access  public
  * @return  Response
  */
 public function action_login()
 {
  $this->title .= ' > Login';

  if(Input::post()) //If it is submitted
  {
   $auth = Auth::instance();

   if($auth->login()) //Based on POST name, no need to give ID to it. If login success
   {
    if($auth->member('100')) //If it is a developer
    {
     Response::redirect('admin');
    }
    else //Else, not enough rights
    {
     Session::set_flash('error', '<b>Erreur :</b> Ce compte ne dispose pas des droits necessaires.');
    }
   }
   else //If login fails
   {
    Session::set_flash('error', '<b>Erreur :</b> Les identifiants sont incorrects.');
   }
  }
 }

 public function action_logout()
 {
  $auth = Auth::instance();

  $auth->logout(); //No need to check if user is connected, because else the before method handle and redirect to login

  Response::redirect('admin/login');
 }
}

I know that the before() method is not pretty coded but I'll correct it, I promise ! Thank you in advance. PS : I am sorry for my english, I am french and I am (only) 15 years old, so I am learning but I don't really practice in a real environment.