Fatal error: Class 'Symfony\Component\Config\Loader\Loader' not found in /var/www/html/dev/spa/vendor/symfony/routing/Symfony/Component/Routing/Loader/ClosureLoader.php on line 27

Call Stack:
    0.0003     235952   1. {main}() /var/www/html/dev/spa/vendor/symfony/routing/Symfony/Component/Routing/Loader/ClosureLoader.php:0