Fatal error: Uncaught Error: Class "Symfony\Component\HttpKernel\DataCollector\DataCollector" not found in C:\WebServer\htdocs\bookshelf\vendor\symfony\http-kernel\DataCollector\ExceptionDataCollector.php:23 Stack trace: #0 {main} thrown in C:\WebServer\htdocs\bookshelf\vendor\symfony\http-kernel\DataCollector\ExceptionDataCollector.php on line 23