Fatal error: Class 'Symfony\Component\DependencyInjection\Compiler\MergeExtensionConfigurationPass' not found in /var/www/html/dev/spa/vendor/symfony/http-kernel/Symfony/Component/HttpKernel/DependencyInjection/MergeExtensionConfigurationPass.php on line 23

Call Stack:
    0.0003     236856   1. {main}() /var/www/html/dev/spa/vendor/symfony/http-kernel/Symfony/Component/HttpKernel/DependencyInjection/MergeExtensionConfigurationPass.php:0