Fatal error: Uncaught Error: Class 'Doctrine\Bundle\DoctrineBundle\Repository\ServiceEntityRepository' not found in C:\Apache24\htdocs\InvoiceTracking\src\Repository\InvoiceRepository.php:20 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\InvoiceTracking\src\Repository\InvoiceRepository.php on line 20