Fatal error: Uncaught Error: Class 'Doctrine\Common\DataFixtures\Loader' not found in C:\Apache24\htdocs\InvoiceTracking\vendor\symfony\doctrine-bridge\DataFixtures\ContainerAwareLoader.php:26 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\InvoiceTracking\vendor\symfony\doctrine-bridge\DataFixtures\ContainerAwareLoader.php on line 26