Fatal error: Uncaught Error: Class "Symfony\Component\Console\Descriptor\Descriptor" not found in C:\WebServer\htdocs\bookshelf\vendor\symfony\console\Descriptor\XmlDescriptor.php:27 Stack trace: #0 {main} thrown in C:\WebServer\htdocs\bookshelf\vendor\symfony\console\Descriptor\XmlDescriptor.php on line 27