Fatal error: Uncaught Error: Class "Symfony\Component\HttpKernel\DependencyInjection\Extension" not found in C:\xampp\htdocs\electronica\vendor\liuggio\ExcelBundle\DependencyInjection\LiuggioExcelExtension.php:15 Stack trace: #0 {main} thrown in C:\xampp\htdocs\electronica\vendor\liuggio\ExcelBundle\DependencyInjection\LiuggioExcelExtension.php on line 15