请高手快进来，急急急！急啊！万分火急！ant在MyEclipse中的出错

build.xml 文件如下：
<?xml version="1.0" encoding="gbk"?>
<project name="OA系统构建脚本" default="生成Hibernate配置文件" basedir=".">
<project name="src.dir" value="${basedir}/src"/>
<project name="xdoclet.home" value="C:/xdoclet-plugins-dist-1.0.4"/><!-- build classpath -->
<path id="xdoclet.task.classpath">
     <fileset dir="${xdoclet.home}/lib">
         <include name="**/*.jar"/>
     </fileset>
</path><taskdef name="xdoclet" classname="org.xdoclet.ant.XDocletTask"
classpathref="xdoclet.task.classpath"
/><target name="生成Hibernate配置文件">
 <xdoclet>
    <fileset dir="${src.dir}/com/oa/model">
        <include name="**/*.java"/>
    </fileset>
     <component 
         classname="org.xdoclet.plugin.hibernate.HibernateConfigPlugin"
         destdir="${src.dir}"
         version="3.0"
         jdbcurl="jdbc:mysql://localhost:3306/oa"
         jdbcdriver="com.mysql.jdbc.Driver"
         jdbcusername="root"
         jdbcpassword="1"
         dialect="org.hibernate.dialect.MySQLDialect"
         showsql="true"
       />
 </xdoclet>
     </target>  
     
     <target name="生成hibernate映射文件">
        <xdoclet>
        <fileset dir="${src.dir}/com/oa/model">
           <include name="**/*.java"/>
        </fileset>
        <component
         classname="org.xdoclet.plugin.hibernate.HibernateMappingPlugin"
         version="3.0"
         hbm2ddlauto="update"
         destdir="${src.dir}"
         />
         </xdoclet>
     </target>
</project>加载时出现如下内容：OA系统构建脚本<C:\Documents and Settings\hp\workspaxe\OA\${xdoclet.home}\lib not found.
build.xml运行时出现如下内容：Buildfile: C:\Documents and Settings\hp\workspace\OA\build.xmlBUILD FAILED
C:\Documents and Settings\hp\workspace\OA\build.xml:3: Problem: failed to create task or type project
Cause: The name is undefined.
Action: Check the spelling.
Action: Check that any custom tasks/types have been declared.
Action: Check that any <presetdef>/<macrodef> declarations have taken place.
Total time: 1 second