Edit file File name : RouteGroup.php Content :<?php /** * Slim Framework (https://slimframework.com) * * @license https://github.com/slimphp/Slim/blob/3.x/LICENSE.md (MIT License) */ namespace Slim; use Closure; use Slim\Interfaces\RouteGroupInterface; class RouteGroup extends Routable implements RouteGroupInterface { /** * {@inheritdoc} */ public function __invoke(App $app = null) { $callable = $this->resolveCallable($this->callable); if ($callable instanceof Closure && $app !== null) { $callable = $callable->bindTo($app); } $callable($app); } } Save