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几个月前我已经将我的 symfony projet 版本从 3.3 升级到 3.4，一切都醒了，但我最近尝试添加一个事件监听器，然后我得到了那个错误

The configuration key "public" cannot be used to define a default value in "/home/pc-dev/Labs/Projets-jebuy/je-buy.com/app/config/services.yml". Allowed keys are "private", "tags", "autowire", "autoconfigure", "bind" in /home  
  /pc-dev/Labs/Projets-jebuy/je-buy.com/app/config/services.yml (which is being imported from "/home/pc-dev/Labs/Projets-jebuy/je-buy.com/app/config/config.yml").

显然没有什么我从这里编辑了默认的 service.yml 文件

    # default configuration for services in *this* file
    _defaults:
        # automatically injects dependencies in your services
        autowire: true
        # automatically registers your services as commands, event subscribers, etc.
        autoconfigure: true
        # this means you cannot fetch services directly from the container via $container->get()
        # if you need to do this, you can override this setting on individual services
        public: false
    twig.extension:
        class: AppBundle\Twig\Extension\MenuExtension
        arguments:
            - '@doctrine'
        tags:
            - {name : twig.extension }
#    service.extension:
#        class: AdminBundle\DependencyInjection\AdminExtension
#        arguments: []
#        tags: []

对此（因为在 symfony 3.4 或 4 中，所有服务默认都是私有的）

services:
    # default configuration for services in *this* file
    _defaults:
        # automatically injects dependencies in your services
        autowire: true
        # automatically registers your services as commands, event subscribers, etc.
        autoconfigure: true
        # this means you cannot fetch services directly from the container via $container->get()
        # if you need to do this, you can override this setting on individual services
        private: true
    twig.extension:
        class: AppBundle\Twig\Extension\MenuExtension
        arguments:
            - '@doctrine'
        tags:
            - {name : twig.extension }
#    service.extension:
#        class: AdminBundle\DependencyInjection\AdminExtension
#        arguments: []
#        tags: []

但是当我尝试运行服务器时，我现在遇到了这个错误

 The service "templating.loader.cache" has a dependency on a non-existent service "templating.loader.wrapped".

而且我现在不知道如何解决它，那个 template.loder.wrapped 服务在哪里。

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