zend-framework2 – ZF2无效工厂已注册

While attempting to create applicationformuserform(alias: ApplicationForm
UserForm) an invalid factory was registered for this instance type.

UserFormFactory.php

<?php

namespace ApplicationFactoryForm;

use ZendServiceManagerFactoryInterface;
use ZendServiceManagerServiceLocatorInterface;
use ApplicationFormUserForm;

class UserFormFactory implements FactoryInterface {

    public function createService(ServiceLocatorInterface $serviceLocator) {
        $services         = $serviceLocator->getServiceLocator();
        $entityManager    = $services->get('DoctrineORMEntityManager');

        $form = new UserForm($entityManager);

        return $form;
    }
}

?>

UserForm.php

<?php

namespace ApplicationForm;

use ZendFormForm;
use ZendInputFilterInputFilterProviderInterface;
use DoctrineORMEntityManager;

class UserForm extends Form implements InputFilterProviderInterface {

    protected $entityManager;

    public function __construct(EntityManager $entityManager) {
        parent::__construct();
        $this->entityManager = $entityManager;
    }

    public function init() {
        $this->add(array(
                'name' => 'username','attributes' => array(
                        'type'  => 'text',),'options' => array(
                        'label' => 'User Name',));
        $this->add(array(
                'name' => 'first_name','options' => array(
                        'label' => 'First Name',));
        $this->add(array(
                'name' => 'last_name','options' => array(
                        'label' => 'Last Name',));
        $this->add(array(
                'name' => 'role_id','type' => 'DoctrineModuleFormElementObjectSelect','options' => array(
                        'object_manager'     => $this->entityManager,'target_class'       => 'ApplicationEntityRole','property' => 'id','is_method' => true,'find_method'        => array(
                                'name'   => 'getRoles','label' => 'User Role',));
    }

    public function getInputFilterSpecification() {
        return array(); // filter and validation here
    }
}

?>

Module.config.php

'form_elements' => array(
            'factories' => array(
                    'ApplicationFormUserForm' => 'ApplicationFactoryFormUserFormFactory',

而我正在另一个控制器工厂使用这个表格工厂

UserControllerFactory.php

<?php

namespace MemberFactoryController;

use ZendServiceManagerFactoryInterface;
use ZendServiceManagerServiceLocatorInterface;
use MemberControllerUserController;
use ApplicationFormUserForm;

class UserControllerFactory implements FactoryInterface {

    public function createService(ServiceLocatorInterface $serviceLocator) {
        $services    = $serviceLocator->getServiceLocator();
        $userForm    = $services->get('FormElementManager')->get('ApplicationFormUserForm');

        $controller  = new UserController($userForm);

        return $controller;
    }
}

?>

谁能告诉我可能是什么问题？