Invalid location of tag(th)

 1     <table border="1">
 2         <thead>
 3             <tr>
 4                 <th>用户名</th>
 5                 <th>密码</th>
 6             </tr>
 7         </thead>
 8         <tbody>
 9 
10             {% for line in data %}
11                 <tr>
12                     <td> {{ line.user}} </td>
13                     <td> {{ line.pwd }}</td>
14                 </tr>
15             {% endfor %}
16 
17         </tbody>
18     </table>