Fatal error: Uncaught Error: Class 'Doctrine\ORM\ORMException' not found in C:\Apache24\htdocs\cwlms\vendor\doctrine\orm\lib\Doctrine\ORM\OptimisticLockException.php:30 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\cwlms\vendor\doctrine\orm\lib\Doctrine\ORM\OptimisticLockException.php on line 30