Struts2学习遇到的一个小问题

最近在学习strut2，在做一个小例子的时候遇到这样的问题，一直没办法解决，麻烦各路大神帮小弟找出问题的原因
先上代码：
strut.xml：

<constant name="struts.devMode" value="true" />

<package name="package2" namespace="/user2" extends="struts-default">

    

    	<interceptors>

    		<interceptor name="checkLogin" class="com.hhg.interceptor.CheckLoginInterceptor"></interceptor>

    		<interceptor-stack name="checkLoginInterceptor">

    			<interceptor-ref name="checkLogin"></interceptor-ref>

    			<interceptor-ref name="defaultStack"></interceptor-ref>

    		</interceptor-stack>

    	</interceptors>

    	

    	<default-interceptor-ref name="checkLoginInterceptor"></default-interceptor-ref>

    

    	<global-results>

    		<result name="error">/jsp/Error.jsp</result>

    	</global-results>

    

    	<action name="login" class="com.hhg.action.LoginAction">

    		<interceptor-ref name="defaultStack"></interceptor-ref>

            <result name="success">/jsp/Login2.jsp</result>

        </action>

        

        <action name="score" class="com.hhg.action.ScoreAction" method="{*}">

            <result name="success">/jsp/Interceptor_Success.jsp</result>

        </action>

    </package>

Login.jsp:

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<title>首页</title>

</head>

<body>

	<form name="userlogin" action="<%=request.getContextPath()%>/user2/login" method="post">

		username : <input name="username" type="text"/>

		password : <input name="password" type="password"/>

		<input type="submit" value="submit"/>

	</form>

	

	<a href="<%=request.getContextPath()%>/user2/score!add">增加</a>

	<a href="<%=request.getContextPath()%>/user2/score!delete">删除</a>

	<a href="<%=request.getContextPath()%>/user2/score!update">修改</a>

	<a href="<%=request.getContextPath()%>/user2/score!search">查看</a>

</body>

</html>

ScoreAction.java

import com.opensymphony.xwork2.ActionSupport;



public class ScoreAction extends ActionSupport{



	public String add() {

		System.out.println("ScoreAction的add方法");

		return SUCCESS;

	}

	public String delete() {

		System.out.println("ScoreAction的delete方法");

		return SUCCESS;

	}

	public String update() {

		System.out.println("ScoreAction的update方法");

		return SUCCESS;

	}

	public String search() {

		System.out.println("ScoreAction的search方法");

		return SUCCESS;

	}

}

先不考虑拦截器，在点击jsp页面中的增加/删除/修改/查看时，报错如下：
There is no Action mapped for namespace [/user2] and action name [score!add] associated with context path [/MyStruts2]

看了代码没找出问题所在，麻烦帮忙解答一下，谢谢