如何解决：“密钥” Symfony配置文件下无法识别的选项“ config”

Question

Symfony无法识别YAML文件中的所有键“ config”。 喜欢：

httplug:
    classes:
        client: Http\Adapter\Guzzle6\Client
        message_factory: Http\Message\MessageFactory\GuzzleMessageFactory
        uri_factory: Http\Message\UriFactory\GuzzleUriFactory
        stream_factory: Http\Message\StreamFactory\GuzzleStreamFactory
    clients:
        guzzle6:
            factory: 'httplug.factory.guzzle6'
            config:
                 verify: false
                 timeout: 2