diff --git a/.env.test b/.env.test
index 414430e7ff..46e0e41acd 100644
--- a/.env.test
+++ b/.env.test
@@ -1,4 +1,4 @@
 # define your env variables for the test env here
-KERNEL_CLASS='App\Kernel'
+KERNEL_CLASS='Chamilo\Kernel'
 APP_SECRET='s$cretf0rt3st'
 SYMFONY_DEPRECATIONS_HELPER=999999
diff --git a/composer.json b/composer.json
index c4dda2f793..daae1fc61f 100755
--- a/composer.json
+++ b/composer.json
@@ -63,14 +63,14 @@
         "sensiolabs/security-checker": "~6.0",
 
         "symfony/asset": "^4.0",
-        "symfony/dotenv": "^4.0",
+        "symfony/dotenv": "^5.0",
         "symfony/expression-language": "^4.0",
-        "symfony/flex": "^1.0",
+        "symfony/flex": "^1.6",
         "symfony/form": "^4.0",
         "symfony/framework-bundle": "^4.0",
         "symfony/http-kernel": "^4.0",
         "symfony/monolog-bundle": "^3.1",
-        "symfony/mailer": "^4.0",
+        "symfony/mailer": "^5.0",
         "symfony/polyfill-apcu": "^1.9",
         "symfony/requirements-checker": "^1.1",
         "symfony/security-bundle": "^4.0",
@@ -78,7 +78,7 @@
         "symfony/translation": "^4.0",
         "symfony/twig-bundle": "^4.0",
         "symfony/validator": "^4.0",
-        "symfony/webpack-encore-bundle": "^1.1",
+        "symfony/webpack-encore-bundle": "^1.7",
         "symfony/yaml": "^4.0",
 
         "tgalopin/html-sanitizer-bundle": "^1.1",
@@ -212,7 +212,7 @@
     "extra": {
         "symfony": {
             "allow-contrib": true,
-            "require": "4.4.*"
+            "require": "5.0.*"
         }
     }
 }
diff --git a/config/packages/framework.yaml b/config/packages/framework.yaml
index ffb2f9aa69..12fa56dd65 100644
--- a/config/packages/framework.yaml
+++ b/config/packages/framework.yaml
@@ -14,4 +14,4 @@ framework:
         name: chamilo2
     fragments: ~
     http_method_override: true
-    annotations: true
+    annotations: true
\ No newline at end of file
diff --git a/config/packages/sonata_page.yaml b/config/packages/sonata_page.yaml
index 424afb3bc8..2b0f41a545 100644
--- a/config/packages/sonata_page.yaml
+++ b/config/packages/sonata_page.yaml
@@ -21,17 +21,9 @@ sonata_page:
         - ^/connect/(.*)
         - ^/editor/(.*)
         - ^/login/(.*)
-        - ^/main(.*)
-        - ^/plugin(.*)
+        - ^/error
         - ^/packages/(.*)
         - ^/package/(.*)
-        - ^install
-        - ^/install/(.*)
-        - install.php
-        - install.php/(.*)
-        - install.php/packages/(.*)
-        - install.php/package/(.*)
-        - install.php/(.*)/(.*)
         - ^/bundles/(.*)
         - ^/_wdt/(.*)
         - ^/_profiler/(.*)
diff --git a/config/packages/twig.yaml b/config/packages/twig.yaml
index e37f3b3c38..c792e77171 100644
--- a/config/packages/twig.yaml
+++ b/config/packages/twig.yaml
@@ -9,7 +9,9 @@ twig:
         - '@SonataFormatter/Form/formatter.html.twig'
         - '@SonataCore/Form/datepicker.html.twig'
         - '@SonataCore/Form/color.html.twig'
-    exception_controller: 'Chamilo\ThemeBundle\Controller\ExceptionController::showAction'
+
+    exception_controller: Chamilo\CoreBundle\Controller\ExceptionController::showAction
+
     globals:
         show_toolbar: true
         show_footer: true
diff --git a/config/routes/dev/twig.yaml b/config/routes/dev/twig.yaml
index f4ee83960b..bcbbf13d08 100644
--- a/config/routes/dev/twig.yaml
+++ b/config/routes/dev/twig.yaml
@@ -1,3 +1,3 @@
 _errors:
-    resource: '@TwigBundle/Resources/config/routing/errors.xml'
+    resource: '@FrameworkBundle/Resources/config/routing/errors.xml'
     prefix: /_error
diff --git a/config/services.yaml b/config/services.yaml
index d72dfe26f3..f044ef9371 100644
--- a/config/services.yaml
+++ b/config/services.yaml
@@ -1,6 +1,7 @@
 # Put parameters here that don't need to change on each machine where the app is deployed
 # https://symfony.com/doc/current/best_practices/configuration.html#application-related-configuration
 parameters:
+    app_env: '%env(APP_ENV)%'
     password_encryption: '%env(APP_ENCRYPT_METHOD)%'
     secret: '%env(APP_SECRET)%'
     locale: '%env(APP_LOCALE)%'
@@ -19,7 +20,6 @@ parameters:
     glide_config:
         source: 'oneup_flysystem.resources_filesystem'
         cache: 'oneup_flysystem.cache_resources_filesystem'
-        #cache: 'var/cache/resource/'
 
     glide_media_filters:
         editor_thumbnail:
@@ -87,11 +87,6 @@ services:
         exclude: '../src/ThemeBundle/{Entity,Migrations,Tests}'
         public: true
 
-    Chamilo\ThemeBundle\Controller\ExceptionController:
-        public: true
-        arguments:
-            $debug: '%kernel.debug%'
-
     Doctrine\ORM\EntityManager: "@doctrine.orm.default_entity_manager"
 
     chamilo_core.hook_factory:
@@ -170,17 +165,10 @@ gregwar_captcha:
     height: 50
     length: 6
 
+cocur_slugify:
+    lowercase: true
+
 imports:
     - {resource: ../src/CoreBundle/Resources/config/services.yml}
     - {resource: ../src/PageBundle/Resources/config/services.yml}
     - {resource: ../vendor/knplabs/doctrine-behaviors/config/orm-services.yml}
-
-#sylius_resource:
-#    resources:
-#        app.exercise_category:
-#            driver: 'doctrine/orm'
-#            classes:
-#                model: 'Chamilo\CourseBundle\Entity\CExerciseCategory'
-
-cocur_slugify:
-    lowercase: true
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index 00fc9ae088..2376661328 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -9,11 +9,11 @@
 >
     <php>
         <ini name="error_reporting" value="-1" />
+        <ini name="display_errors" value="true"/>
         <server name="APP_ENV" value="test" force="true" />
         <server name="SHELL_VERBOSITY" value="-1" />
         <server name="SYMFONY_PHPUNIT_REMOVE" value="" />
         <server name="SYMFONY_PHPUNIT_VERSION" value="7.5" />
-        <server name="KERNEL_CLASS" value="Chamilo\Kernel" />
     </php>
 
     <testsuites>
diff --git a/public/main/calendar/agenda_js.php b/public/main/calendar/agenda_js.php
index 9082e8835a..a174ecdb10 100644
--- a/public/main/calendar/agenda_js.php
+++ b/public/main/calendar/agenda_js.php
@@ -1,9 +1,6 @@
 <?php
-/* For licensing terms, see /license.txt */
 
-/**
- * @package chamilo.calendar
- */
+/* For licensing terms, see /license.txt */
 
 // use anonymous mode when accessing this course tool
 $use_anonymous = true;
diff --git a/public/main/inc/lib/api.lib.php b/public/main/inc/lib/api.lib.php
index 25e2eb4fdf..d8add7320d 100644
--- a/public/main/inc/lib/api.lib.php
+++ b/public/main/inc/lib/api.lib.php
@@ -7,15 +7,12 @@ use Chamilo\CoreBundle\Entity\Session as SessionEntity;
 use Chamilo\CoreBundle\Entity\SettingsCurrent;
 use Chamilo\CoreBundle\Framework\Container;
 use Chamilo\CourseBundle\Entity\CGroupInfo;
-use Chamilo\CourseBundle\Entity\CItemProperty;
 use Chamilo\ThemeBundle\Controller\ExceptionController;
 use Chamilo\UserBundle\Entity\User;
 use ChamiloSession as Session;
 use Symfony\Bridge\Twig\Mime\TemplatedEmail;
-use Symfony\Component\Debug\Exception\FlattenException;
 use Symfony\Component\Finder\Finder;
 use Symfony\Component\Mime\Address;
-use Symfony\Component\Mime\Email;
 use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
 
 /**
@@ -3658,23 +3655,10 @@ function api_not_allowed(
     $message = null,
     $responseCode = 0
 ) {
-    $debug = api_get_setting('server_type') === 'test';
-
-    // Default code is 403 forbidden
-    $responseCode = empty($responseCode) ? 403 : $responseCode;
     $message = empty($message) ? get_lang('You are not allowed') : $message;
+    Session::write('error_message', $message);
 
-    // Create new exception rendered by template:
-    // src/ThemeBundle/Resources/views/Exception/error.html.twig
-
-    // if error is 404 then the template is:
-    // src/ThemeBundle/Resources/views/Exception/error404.html.twig
-    $exception = new Exception($message);
-    $request = Container::getRequest();
-    $exception = FlattenException::create($exception, $responseCode);
-    $controller = new ExceptionController(Container::getTwig(), $debug);
-    $response = $controller->showAction($request, $exception);
-    $response->send();
+    header('Location: '.api_get_path(WEB_PUBLIC_PATH).'error');
     exit;
 }
 
diff --git a/src/CoreBundle/Controller/ExceptionController.php b/src/CoreBundle/Controller/ExceptionController.php
new file mode 100644
index 0000000000..bcf84fb56f
--- /dev/null
+++ b/src/CoreBundle/Controller/ExceptionController.php
@@ -0,0 +1,83 @@
+<?php
+
+/* For licensing terms, see /license.txt */
+
+namespace Chamilo\CoreBundle\Controller;
+
+use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
+use Symfony\Component\ErrorHandler\Exception\FlattenException;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpKernel\Exception\HttpException;
+use Symfony\Component\Routing\Annotation\Route;
+
+class ExceptionController extends AbstractController
+{
+    public function showAction(FlattenException $exception)
+    {
+        if ('dev' === $this->getParameter('app_env')) {
+            throw new HttpException($exception->getCode(), $exception->getMessage());
+        }
+
+        $showException = true;
+        $name = $showException ? 'exception' : 'error';
+        $code = $exception->getCode();
+        $format = 'html';
+        $loader = $this->container->get('twig')->getLoader();
+        // when not in debug, try to find a template for the specific HTTP status code and format
+        if (!$showException) {
+            $template = sprintf('@ChamiloTheme/Exception/%s%s.%s.twig', $name, $code, $format);
+            if ($loader->exists($template)) {
+                return $template;
+            }
+        }
+
+        // try to find a template for the given format
+        $template = sprintf('@ChamiloTheme/Exception/%s.%s.twig', $name, $format);
+        if ($loader->exists($template)) {
+            return $template;
+        }
+
+        // default to a generic HTML exception
+        //$request->setRequestFormat('html');
+        $template = sprintf('@ChamiloTheme/Exception/%s.html.twig', $showException ? 'exception_full' : $name);
+
+        return $this->render($template, ['exception' => $exception]);
+    }
+
+    /**
+     * @Route("/error")
+     */
+    public function errorAction(Request $request)
+    {
+        $message = $request->getSession()->get('error_message', '');
+        $exception = new FlattenException();
+        $exception->setCode(500);
+
+        $exception->setMessage($message);
+
+        $showException = true;
+        $name = $showException ? 'exception' : 'error';
+        $code = $exception->getCode();
+        $format = 'html';
+        $loader = $this->container->get('twig')->getLoader();
+        // when not in debug, try to find a template for the specific HTTP status code and format
+        if (!$showException) {
+            $template = sprintf('@ChamiloTheme/Exception/%s%s.%s.twig', $name, $code, $format);
+            if ($loader->exists($template)) {
+                return $template;
+            }
+        }
+
+        // try to find a template for the given format
+        $template = sprintf('@ChamiloTheme/Exception/%s.%s.twig', $name, $format);
+        if ($loader->exists($template)) {
+            return $template;
+        }
+
+        // default to a generic HTML exception
+        //$request->setRequestFormat('html');
+        $template = sprintf('@ChamiloTheme/Exception/%s.html.twig', $showException ? 'exception_full' : $name);
+
+        return $this->render($template, ['exception' => $exception]);
+    }
+}
diff --git a/src/CoreBundle/Entity/Manager/SessionManager.php b/src/CoreBundle/Entity/Manager/SessionManager.php
index 525f882950..8e677e98f0 100644
--- a/src/CoreBundle/Entity/Manager/SessionManager.php
+++ b/src/CoreBundle/Entity/Manager/SessionManager.php
@@ -8,7 +8,7 @@ use Chamilo\CoreBundle\Entity\Course;
 use Chamilo\CoreBundle\Entity\Session;
 use Chamilo\CoreBundle\Entity\SessionRelUser;
 use Chamilo\UserBundle\Entity\User;
-use Sonata\CoreBundle\Model\BaseEntityManager;
+use Sonata\Doctrine\Entity\BaseEntityManager;
 
 /**
  * Class SessionManager.
diff --git a/src/CoreBundle/Entity/Manager/SettingsCurrentManager.php b/src/CoreBundle/Entity/Manager/SettingsCurrentManager.php
index 9714c1fe16..8a960995e4 100644
--- a/src/CoreBundle/Entity/Manager/SettingsCurrentManager.php
+++ b/src/CoreBundle/Entity/Manager/SettingsCurrentManager.php
@@ -4,7 +4,7 @@
 
 namespace Chamilo\CoreBundle\Entity\Manager;
 
-use Sonata\CoreBundle\Model\BaseEntityManager;
+use Sonata\Doctrine\Entity\BaseEntityManager;
 
 /**
  * Class SettingsCurrentRepository.
diff --git a/src/CoreBundle/Menu/NavBuilder.php b/src/CoreBundle/Menu/NavBuilder.php
index 3b8e4093aa..adbbb006b8 100644
--- a/src/CoreBundle/Menu/NavBuilder.php
+++ b/src/CoreBundle/Menu/NavBuilder.php
@@ -11,6 +11,7 @@ use Knp\Menu\FactoryInterface;
 use Knp\Menu\ItemInterface;
 use Symfony\Component\DependencyInjection\ContainerAwareInterface;
 use Symfony\Component\DependencyInjection\ContainerAwareTrait;
+use Symfony\Component\Security\Core\Authorization\AuthorizationChecker;
 
 /**
  * Class NavBuilder.
@@ -20,10 +21,12 @@ class NavBuilder implements ContainerAwareInterface
     use ContainerAwareTrait;
 
     private $factory;
+    private $checker;
 
-    public function __construct(FactoryInterface $factory)
+    public function __construct(FactoryInterface $factory, AuthorizationChecker $checker)
     {
         $this->factory = $factory;
+        $this->checker = $checker;
     }
 
     /**
@@ -60,7 +63,7 @@ class NavBuilder implements ContainerAwareInterface
     public function menuApp(array $options): ItemInterface
     {
         $container = $this->container;
-        $checker = $container->get('security.authorization_checker');
+        $checker = $this->checker;
         $translator = $container->get('translator');
         $router = $container->get('router');
         $factory = $this->factory;
diff --git a/src/CoreBundle/Resources/config/services.yml b/src/CoreBundle/Resources/config/services.yml
index e0f85fa0e6..ef39d9faca 100644
--- a/src/CoreBundle/Resources/config/services.yml
+++ b/src/CoreBundle/Resources/config/services.yml
@@ -217,6 +217,9 @@ services:
 
     chamilo_core.menu.nav_builder:
         class: Chamilo\CoreBundle\Menu\NavBuilder
+        arguments:
+            - '@knp_menu.factory'
+            - '@security.authorization_checker'
         calls:
             - [setContainer, ['@service_container']]
         tags:
diff --git a/src/ThemeBundle/Controller/ExceptionController.php b/src/ThemeBundle/Controller/ExceptionController.php
deleted file mode 100644
index 1475d5c664..0000000000
--- a/src/ThemeBundle/Controller/ExceptionController.php
+++ /dev/null
@@ -1,54 +0,0 @@
-<?php
-
-/* For licensing terms, see /license.txt */
-
-namespace Chamilo\ThemeBundle\Controller;
-
-use Symfony\Bundle\TwigBundle\Controller\ExceptionController as BaseExceptionController;
-use Symfony\Component\HttpFoundation\Request;
-use Symfony\Component\Templating\TemplateReference;
-
-/**
- * Class ExceptionController.
- */
-class ExceptionController extends BaseExceptionController
-{
-    /**
-     * @param string $format
-     * @param int    $code
-     * @param bool   $showException
-     *
-     * @return TemplateReference
-     */
-    protected function findTemplate(Request $request, $format, $code, $showException)
-    {
-        // Only show custom error when APP_DEBUG = 0
-        if ($showException) {
-            return parent::findTemplate($request, $format, $code, $showException);
-        }
-
-        $name = $showException ? 'exception' : 'error';
-        if ($showException && 'html' == $format) {
-            $name = 'exception_full';
-        }
-
-        // when not in debug, try to find a template for the specific HTTP status code and format
-        if (!$showException) {
-            $template = sprintf('@ChamiloTheme/Exception/%s%s.%s.twig', $name, $code, $format);
-            if ($this->templateExists($template)) {
-                return $template;
-            }
-        }
-
-        // try to find a template for the given format
-        $template = sprintf('@ChamiloTheme/Exception/%s.%s.twig', $name, $format);
-        if ($this->templateExists($template)) {
-            return $template;
-        }
-
-        // default to a generic HTML exception
-        $request->setRequestFormat('html');
-
-        return sprintf('@ChamiloTheme/Exception/%s.html.twig', $showException ? 'exception_full' : $name);
-    }
-}
diff --git a/src/ThemeBundle/Resources/views/Exception/exception_full.html.twig b/src/ThemeBundle/Resources/views/Exception/exception_full.html.twig
index b73d88b2dd..f58750eeec 100644
--- a/src/ThemeBundle/Resources/views/Exception/exception_full.html.twig
+++ b/src/ThemeBundle/Resources/views/Exception/exception_full.html.twig
@@ -1,4 +1,5 @@
 {% extends '@ChamiloTheme/Layout/base-layout.html.twig' %}
+
 {% block page_title %} Error {% endblock %}
 {% block page_subtitle %} {{ status_code }} {% endblock %}
 {% block page_content %}
diff --git a/src/ThemeBundle/Resources/views/Layout/sidebar.html.twig b/src/ThemeBundle/Resources/views/Layout/sidebar.html.twig
index 666bd0682b..4d613b19a8 100644
--- a/src/ThemeBundle/Resources/views/Layout/sidebar.html.twig
+++ b/src/ThemeBundle/Resources/views/Layout/sidebar.html.twig
@@ -4,8 +4,7 @@
         <nav class="sidebar-nav">
             {% set menu = knp_menu_get('menuApp') %}
             {{ knp_menu_render(menu, {'ancestorClass': 'current_open open', 'template': '@ChamiloTheme/Menu/left_menu.html.twig'}) }}
-        </nav>
-        {#<button class="sidebar-minimizer brand-minimizer" type="button"></button>#}
+         </nav>
     </div>
 {% endif %}
 {% endautoescape %}
\ No newline at end of file