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