Unknown tag (s:textfiled)

struts2 的一个登陆界面代码
<%@ page language="java" contentType="text/html; charset=utf-8"  %><%@ taglib prefix="s" uri="/struts-tags"%>
 
<html>
  <head>
     <title>登录页面</title>
  </head>
  <body>
     <s:form action="loginUser">
        <s:textfiled name="username" label="用户"/>
        <s:textfiled name="password" label="密码"/>
        <s:submit value="登录"/>
     </s:form>
   </body>
</html>