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