Fatal error: Uncaught Error: Class "Symfony\Component\HttpKernel\DataCollector\DataCollector" not found in C:\mywamp\sites\allsite\calcomposer\vendor\symfony\http-kernel\DataCollector\RouterDataCollector.php:24 Stack trace: #0 {main} thrown in C:\mywamp\sites\allsite\calcomposer\vendor\symfony\http-kernel\DataCollector\RouterDataCollector.php on line 24