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