Fatal error: Uncaught Error: Class "Symfony\Component\Process\Pipes\AbstractPipes" not found in /users/ms-it/www/oc/lib/composer/symfony/process/Pipes/UnixPipes.php:23 Stack trace: #0 {main} thrown in /users/ms-it/www/oc/lib/composer/symfony/process/Pipes/UnixPipes.php on line 23