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