Hibernate配置文件突然自己出问题了，找不到原因请大家帮忙

error提示：Referenced file contains errors (http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd).
  刚写几个字儿就出问题了，后来撤销回原样还是出问题配置文件部分代码：<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
          "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
          "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"><!-- Generated by MyEclipse Hibernate Tools. -->
<hibernate-configuration> <session-factory><!--
<property name="show_sql">true</property>
<property name="format_sql">true</property>-->
<mapping class="com.webapp.model.businessobject.Users" />
<mapping class="com.webapp.model.businessobject.Attributes" />
<mapping class="com.webapp.model.businessobject.Actions" />
<mapping class="com.webapp.model.businessobject.Roles" />
<mapping class="com.webapp.model.businessobject.RolesUsers" />
<mapping class="com.webapp.model.businessobject.AddressGroup" />
<mapping class="com.webapp.model.businessobject.Models" />
<mapping class="com.webapp.model.businessobject.Teams" />
<mapping class="com.webapp.model.businessobject.TeamsUsers" />
</session-factory>
</hibernate-configuration>