Fatal error: Class 'Symfony\Component\Config\Loader\FileLoader' not found in /var/www/html/dev/spa/vendor/symfony/routing/Symfony/Component/Routing/Loader/PhpFileLoader.php on line 28

Call Stack:
    0.0004     239744   1. {main}() /var/www/html/dev/spa/vendor/symfony/routing/Symfony/Component/Routing/Loader/PhpFileLoader.php:0