Edit File: SecurityPolicy.php
<?php use Twig\Sandbox\SecurityPolicy; class_exists('Twig\Sandbox\SecurityPolicy'); @trigger_error(sprintf('Using the "Twig_Sandbox_SecurityPolicy" class is deprecated since Twig version 2.7, use "Twig\Sandbox\SecurityPolicy" instead.'), E_USER_DEPRECATED); if (\false) { /** @deprecated since Twig 2.7, use "Twig\Sandbox\SecurityPolicy" instead */ class Twig_Sandbox_SecurityPolicy extends SecurityPolicy { } }