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