jsp页面引用<c:forEach>

 Action.java 中 print方法public String print()throws Exception
    {  
      list=(List<AdAccountBook>) adAccountBookManager.getList(searchKey, approveStatus);
 
     //   System.out.println(list.size());
     success=true;
     return SUCCESS;
    }jsp页面
<%@ page language="java" pageEncoding="gbk"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>调查表</title>
<style type="text/css">
table{border-collapse:collapse;border-spacing:0;border-left:1px solid #888;border-top:1px solid #888;background:#efefef;}</style>
</head><body>
  <div align="center"><font size="+2">户外广告泊位设施调查表</font></div>
  <table align="center" border="1">
<c:forEach items="${list}" var="s">           
<tr>
<td>
    ${s.id}  
</td>
</tr>
</c:forEach> </table></body>
</html><c:forEach items="${list}" var="s"> 其中  "${list}" 报 Missing quotes for attribute value 请问如何解决