This error occured : "Zend\ServiceManager\ServiceManager::get was unable to fetch or create an instance for Doctrine\ORM\EntityManager". I use `ObjectManagerInitializer` with a controller. Service `Doctrine\ORM\EntityManager` must be retrieve from `$serviceLocator->getServiceLocator()->get()` because with a controller we have a `ControllerManager` instance and not directly `ServiceManager`. Actually service is retrieve from `$serviceLocator->get()` so it can't work I think.