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