Fatal error: Class 'Symfony\Component\DependencyInjection\Extension\Extension' not found in /var/www/html/dev/spa/vendor/symfony/http-kernel/Symfony/Component/HttpKernel/DependencyInjection/Extension.php on line 22

Call Stack:
    0.0004     235088   1. {main}() /var/www/html/dev/spa/vendor/symfony/http-kernel/Symfony/Component/HttpKernel/DependencyInjection/Extension.php:0