启动项目maven报插件错误

一启动项目maven插件错误： 修改Windows-preferences-maven-user settings-open file-settings.xml

 <proxies>    
    <proxy>
      <id>optional</id>
      <active>true</active>
      <protocol>http</protocol>
      <username></username>
      <password></password>
      <host>192.168.2.168</host>
      <port>51234</port>  <nonProxyHosts>192.168.1.253|localhost</nonProxyHosts>
    </proxy>
  </proxies>