collection-crud/config/routes/dev/framework.php

<?php declare(strict_types=1);

use Symfony\Component\Routing\Loader\Configurator\RoutingConfigurator;

return static function (RoutingConfigurator $routingConfigurator): void {
	$routingConfigurator->import('@FrameworkBundle/Resources/config/routing/errors.xml')
		->prefix('/_error');
};