Fatal error: Uncaught Error: Class 'Doctrine\ORM\Id\AbstractIdGenerator' not found in /home/bucereo/my_project_name/vendor/doctrine/orm/lib/Doctrine/ORM/Id/IdentityGenerator.php:29 Stack trace: #0 {main} thrown in /home/bucereo/my_project_name/vendor/doctrine/orm/lib/Doctrine/ORM/Id/IdentityGenerator.php on line 29