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