Database 设置多个db symfony 2.5时出错

我试图为我的symfony 2.5项目设置2个数据库，但出现以下错误：

 Fatal error: Uncaught exception 'Symfony\Component\DependencyInjection\Exception\InvalidArgumentException' with message 'The service definition "doctrine.dbal.default_connection" does not exist.' \services\vendor\symfony\symfony\src\Symfony\Component\DependencyInjection\Compiler\ReplaceAliasByActualDefinitionPass.php on line 48

Symfony\Component\DependencyInjection\Exception\InvalidArgumentException: The service definition "doctrine.dbal.default_connection" does not exist. in services\vendor\symfony\symfony\src\Symfony\Component\DependencyInjection\ContainerBuilder.php on line 867

Symfony\Component\DependencyInjection\Exception\InvalidArgumentException: Unable to replace alias "doctrine.dbal.default_connection" with "database_connection"

这是我的条令定义config.yml

doctrine:    
    dbal:
        default_connection:   default
        connections:
            default:
                driver:   pdo_mysql
                host:     localhost
                port:     ~
                name:     db1
                user:     root
                password: ~
            log:
                driver:   pdo_mysql
                host:     localhost
                port:     ~
                name:     db2
                user:     root
                password: ~

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有什么建议吗？

当摆弄多个数据库时，错误消息

无法替换alias

提示您的配置中存在键入错误

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使用以下参考仔细检查您的配置：

您的配置看起来不错。尝试清除缓存。已解决：已由参数更改