struts2 <param> 通配符问题

<package name="defualt" namespace="/" extends="struts-default">
<action name="User_*">
<result>
/WEB-INF/jsp/{1}.jsp
</result>
</action>
</package>
<package name="controller" namespace="/Controller" extends="struts-default">
<action name="*Controller" class="mvc.web.controller.login_register.{1}Controller">
<result>
/WEB-INF/jsp/{1}_success.jsp
</result>
<result name="error" type="redirectAction">
<param name="ationName">User_{1}</param>
<param name="namespace">/</param>
</result>
</action>
</package>

//这里<param name="ationName">User_{1}</param>
<param name="namespace">/</param>
报错，为什么？
报错信息 ：ActionUser_{1} cannot be found in the namespace /

相关了解……