Symfony2 : InvalidTypeException in ArrayNode.php line 267:

这真的让我很困扰。我在哪里犯了错误或如何解决此错误。

我收到一个错误，InvalidTypeException in ArrayNode.php line 267: - Invalid type for path "security.providers.in_memory.memory.users.admin:{ password". Expected array, but got string

我正在从symfony食谱中实现控制器。这是我的security.yml

security:
encoders:
    Symfony'Component'Security'Core'User'User: plaintext
    Leo'CLUBBundle'Entity'User: bcrypt
role_hierarchy:
    ROLE_ADMIN: [ROLE_USER]
providers:
    chain_provider:
        chain:
            providers: [in_memory, user_db]
    in_memory:
        memory:
            users:
                admin:{ password: adminpass, roles:ROLE_ADMIN}
    user_db:
        entity:{ class: LeoCLUBBundle:User, property:username }
firewalls:
    main:
        pattern: /.*
        form_login:
            login_path: /login_path
            check_path: /login_check
            default_target_path: /
        logout:
            path: /logout
            target: /
        security: true
        anonymous: true
access_control:
    - { path: /login, roles: IS_AUTHENTICATED_ANONYMOUSLY }
    - { path: /user, roles: ROLE_ADMIN }
    - { path: /.*, roles: IS_AUTHENTICATED_ANONYMOUSLY }