问Log4r配置程序抛出异常实例化EmailOutputter

EN

我正在使用XML文件设置Log4r，并且无法使EmailOutputter正确工作。这是我的输出标签：

<outputter type="EmailOutputter" name="exception_email" trunc="false" level="ERROR" buffsize="10">
        <formatter type="PatternFormatter" pattern="#{pattern}"/>
        <server>#{smtp_address}</server>
        <port>#{smtp_port}</port>
        <domain>#{smtp_domain}</domain>
        <from>logging@#{smtp_domain}</from>
        <to>exceptions@mydomain.com</to>
        <subject>Log Report</subject>
        <immediate_at>ERROR, FATAL</immediate_at>
      </outputter>

我已经三次和四次检查了所有的XML变量是否都是使用RubyMine步骤调试器正确传入的。例外消息是：

未初始化的异常:创建输出程序问题:未初始化的常量Log4r::Configurator::EmailOutputter /usr/local/lib/ruby/gems/1.9.1/gems/log4r-1.1.10/lib/log4r/configurator.rb:87:in block in decode_xml' /usr/local/lib/ruby/1.9.1/rexml/element.rb:905:in块在每个“/usr/local/lib/ruby/1.9.1/rexml/xpath.rb:67:in each' /usr/local/lib/ruby/1.9.1/rexml/xpath.rb:67:ineach”/usr/local/lib/ruby/1.9.1/rexml/element.rb:905:in中在/usr/local/lib/ruby/gems/新的‘/usr/local/lib/ruby/gems/1.9.1/gems/log4r-1.1.10/lib/log4r/configurator.rb:82:in actual_load' /usr/local/lib/ruby/gems/1.9.1/gems/log4r-1.1.10/lib/log4r/configurator.rb:56:inload_xml_file’/root/src/upside/common/upside_logger.rb:16:in initialize' /root/src/upside/common/logger_factory.rb:7:in新的/root/src/upside/common/logger_factory.rb:7:in new_logger' /root/src/upside/config/application.rb:30:in块中1.9.1/gems/activesupport-3.2.11/lib/active_support/lazy_load_hooks.rb:34:in call' /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-3.2.11/lib/active_support/lazy_load_hooks.rb:34:inexecute_hook‘/usr/local/lib/ruby/gems/1.9.1/gems/activesupport-3.2.11/lib/active_support/lazy_load_hooks.rb:26:in block in on_load' /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-3.2.11/lib/active_support/lazy_load_hooks.rb:25:ineach’/usr/local/lib/ruby/gems/1.9.1/gems/activesupport-3.2.11/lib/active_support/懒惰_load_hooks.rb:25:inon_load' /usr/local/lib/ruby/gems/1.9.1/gems/railties-3.2.11/lib/rails/railtie/configuration.rb:43:inbefore_configuration/root/src /usr/ config/application.rb.14:29在<class:Application>' /root/src/upside/config/application.rb:15:in‘/root/src/usr/config/applic.rb:14：<top (required)>' /usr/local/lib/ruby/gems/1.9.1/gems/railties-3.2.11/lib/rails/commands.rb:53:in中需要’before_configuration‘/usr/usr/local/lib/ruby/gems/1.9.1/gems/railties-3.2.11/lib/rails/commands.rb:50:in <top (required)>' /root/src/upside/script/rails:6:in需要‘/root/src/in/script/rails:6:in’

我双倍地检查了gem安装，emailoutputter.rb与其他输出程序一起位于正确的目录中(哪个功能正确)。

谢谢!