web.xml问题

Referenced file contains errors (http://xmlns.jcp.org/xml/ns/javaee/javaee_7.xsd). For more information, right click on the message in the Problems View and select "Show Details..."

如上 新建项目时xml文件里报这个错是什么?需要新增内容吗往xml里

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
  <display-name>servlet_in</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>

</web-app>

package com.imooc.servlet.enquire;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import java.util.Set;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * Servlet implementation class EnqueryServlet
 */
@WebServlet({"/EnqueryServlet", "/servlet/enquery"} )
public class EnqueryServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    /**
     * @see HttpServlet#HttpServlet()
     */
    public EnqueryServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        Map<String,String> map=new HashMap<String,String>();
        map.put("apple","苹果");
        map.put("android","安卓");
        map.put("HuaWei", "华为");
        Set<String> keySet=map.keySet();
        String key1=request.getParameter("key1");
        //boolean flag=false;

        String res=null;
        String res1=null;
        for(String key:keySet) {
            if(key.equals(key1)) {

                    res=map.get(key1);
                    request.setAttribute("value", res);
                    request.getRequestDispatcher("/success.jsp").forward(request, response);
            }else {
              res1=" 没有找到对应的单词解释!";
              HttpSession session=request.getSession();
                session.setAttribute("value1", res1);
                response.setContentType("text/html;charset:utf-8");
                response.sendRedirect("/servlet_advanced/fail.jsp");
                return;
            }
        }





    }

}

​工程名 servlet_in