struts2的struts.xml配置有关问题

struts2的struts.xml配置问题
如果缺少

<package name="strtuts2" extends="struts-default">


</package>



only:

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>

<action name="upload" must match "((package|include|bean|constant)*,unknown-handler-stack?)". at (null:13:10)
struts2的struts.xml配置问题