在Django中显示的Xlwt导出错误信息。

I´m having a hard time with this. I have a button at the bottom of a page. This page shows the render information of a bill, every bill is different so this information changes all the time. The button is there so the users can download the bill as an Excel file. For the download i have this code in my views.py:I´m having a hard time with this. I have a butt