Symfony InvalidConfigurationException for secure_area firewall

Question

I am new to Symfony and I am testing various examples shown in Symfony . However, I get the following error with my security.yml file

InvalidConfigurationException in SecurityExtension.php line 430: No authentication listener registered for the "secure_area" firewall.

My security.yml file is as follows

security:
    providers:
        in_memory:
            memory:
              users:
                foo:
                  password: $2a$12$2nJYjp5DxX0o.ZgGL8ybEOG/MepViC08G1HKVFpjb0BoTDiZd9bCq
                  roles: ROLE_ADMIN

    firewalls:
        secured_area:
            logout:
                path: /logout
                target: /example

        dev:
            pattern: ^/(_(profiler|wdt|error)|css|images|js)/
            security: false


        default:
            anonymous: ~
            http_basic: ~


    access_control:
        - { path: ^/administer, roles: ROLE_ADMIN }

    encoders:
        Symfony\Component\Security\Core\User\User:
            algorithm: bcrypt
            cost: 12

Answer 1

(, form_login ..), security: false. security_area ( ). , secure_area . , .

firewalls:
    dev:
        pattern: ^/(_(profiler|wdt|error)|css|images|js)/
        security: false


    default:
        anonymous: ~
        http_basic: ~

"" security.yml InvalidArgumentException: " " .