Vinicius, boa tarde!
Me deparei com o problema no MAC OS também. Executei o comando proxies, mas deu esse erro aqui:
Fatal error: Uncaught Doctrine\Common\Persistence\Mapping\MappingException: Class 'Alura\Cursos\Controller\Curso' does not exist in /Users/jonathan/Documents/php-mvc-projeto-inicial/vendor/doctrine/persistence/lib/Doctrine/Common/Persistence/Mapping/MappingException.php:93 Stack trace: #0 /Users/jonathan/Documents/php-mvc-projeto-inicial/vendor/doctrine/persistence/lib/Doctrine/Common/Persistence/Mapping/RuntimeReflectionService.php(24): Doctrine\Common\Persistence\Mapping\MappingException::nonExistingClass('Alura\Cursos\Co...') #1 /Users/jonathan/Documents/php-mvc-projeto-inicial/vendor/doctrine/persistence/lib/Doctrine/Common/Persistence/Mapping/AbstractClassMetadataFactory.php(250): Doctrine\Common\Persistence\Mapping\RuntimeReflectionService->getParentClasses('Alura\Cursos\Co...') #2 /Users/jonathan/Documents/php-mvc-projeto-inicial/vendor/doctrine/persistence/lib/Doctrine/Common/Persistence/Mapping/AbstractClassMetadataFactory.php(283): Doctrine\Common\Persistence\Mapping\AbstractClassMetadataFactory->getParentCl in /Users/jonathan/Documents/php-mvc-projeto-inicial/vendor/doctrine/persistence/lib/Doctrine/Common/Persistence/Mapping/MappingException.php on line 93
Pode me ajudar?
