SonataMediaBundle: The "Sonata\MediaBundle\Twig\Extension\MediaExtension" extension is not enabled.

Environment

Symfony 2.8 LTS on PHP 7.1

Sonata packages

sonata-project/admin-bundle              3.15.1                   The missing Symfony Admin Generator
sonata-project/block-bundle              3.3.2                    Symfony SonataBlockBundle
sonata-project/cache                     1.0.7                    Cache library
sonata-project/cache-bundle              2.3.1                    This bundle provides caching services
sonata-project/classification-bundle     3.3.0                    Symfony SonataClassificationBundle
sonata-project/core-bundle               3.3.0                    Symfony SonataCoreBundle
sonata-project/datagrid-bundle           2.2.1                    Symfony SonataDatagridBundle
sonata-project/doctrine-extensions       1.0.2                    Doctrine2 behavioral extensions
sonata-project/doctrine-orm-admin-bundle 3.1.4                    Symfony Sonata / Integrate Doctrine ORM into the SonataAdminBundle
sonata-project/easy-extends-bundle       2.1.10                   Symfony SonataEasyExtendsBundle
sonata-project/exporter                  1.7.1                    Lightweight Exporter library
sonata-project/formatter-bundle          3.2.1                    Symfony SonataFormatterBundle
sonata-project/google-authenticator      1.0.2                    Library to integrate Google Authenticator into a PHP project
sonata-project/intl-bundle               2.3.0                    Symfony SonataIntlBundle
sonata-project/media-bundle              3.5.0                    Symfony SonataMediaBundle
sonata-project/notification-bundle       3.1.0                    Symfony SonataNotificationBundle
sonata-project/page-bundle               3.4.0                    This bundle provides a Site and Page management through container and block services
sonata-project/seo-bundle                2.1.0                    Symfony SonataSeoBundle
sonata-project/user-bundle               3.2.3                    Symfony SonataUserBundle

Symfony packages

symfony/assetic-bundle     v2.8.1  Integrates Assetic into Symfony2
symfony/monolog-bundle     v2.12.1 Symfony MonologBundle
symfony/polyfill-apcu      v1.3.0  Symfony polyfill backporting apcu_* functions to lower PHP versions
symfony/polyfill-intl-icu  v1.3.0  Symfony polyfill for intl's ICU-related data and classes
symfony/polyfill-mbstring  v1.3.0  Symfony polyfill for the Mbstring extension
symfony/polyfill-php54     v1.3.0  Symfony polyfill backporting some PHP 5.4+ features to lower PHP versions
symfony/polyfill-php55     v1.3.0  Symfony polyfill backporting some PHP 5.5+ features to lower PHP versions
symfony/polyfill-php56     v1.3.0  Symfony polyfill backporting some PHP 5.6+ features to lower PHP versions
symfony/polyfill-php70     v1.3.0  Symfony polyfill backporting some PHP 7.0+ features to lower PHP versions
symfony/polyfill-util      v1.3.0  Symfony utilities for portability of PHP codes
symfony/security-acl       v3.0.0  Symfony Security Component - ACL (Access Control List)
symfony/swiftmailer-bundle v2.5.4  Symfony SwiftmailerBundle
symfony/symfony            v2.8.18 The Symfony PHP framework
symfony/var-dumper         v3.2.6  Symfony mechanism for exploring and dumping PHP variables
twig/extensions                          v1.4.1                   Common additional features for Twig that do not directly belong in core
twig/twig                                v1.33.0                  Twig, the flexible, fast, and secure template language for PHP

PHP version

PHP 7.1.0-5+deb.sury.org~xenial+1 (cli) ( NTS )

Steps to reproduce

Uploaded an image to S3. Now when clicking the image in the Media Gallery in the Admin Panel, throws 500

Expected results

Display Image from S3

Actual results

[2017-03-29 10:21:33] request.CRITICAL: Uncaught PHP Exception Twig_Error_Runtime: “The “Sonata\MediaBundle\Twig\Extension\MediaExtension” extension is not enabled.” at /var/www/app/vendor/sonata-project/media-bundle/Resources/views/MediaAdmin/edit.html.twig line 64 {“exception”:“[object] (Twig_Error_Runtime(code: 0): The "Sonata\MediaBundle\Twig\Extension\MediaExtension" extension is not enabled. at /var/www/app/vendor/sonata-project/media-bundle/Resources/views/MediaAdmin/edit.html.twig:64)”} []