Fatal error: Class 'Symfony\Component\HttpKernel\DependencyInjection\Extension' not found in /var/www/html/dev/spa/vendor/symfony/http-kernel/Symfony/Component/HttpKernel/DependencyInjection/ConfigurableExtension.php on line 29

Call Stack:
    0.0002     235968   1. {main}() /var/www/html/dev/spa/vendor/symfony/http-kernel/Symfony/Component/HttpKernel/DependencyInjection/ConfigurableExtension.php:0