cherrypy显示在浏览器显示不了jpg

[迈际]

我在用做图片检索，cherrypy在浏览器端显示不了图片。一开始就只看到图片的额框框，点进去的时候报错如下：

500 Internal Server Error

The server encountered an unexpected condition which prevented it from fulfilling the request.

Traceback (most recent call last):
File "/home/maiji/anaconda3/envs/KCF_TRACKER/lib/python2.7/site-packages/cherrypy/_cprequest.py", line 670, in respond
response.body = self.handler()
File "/home/maiji/anaconda3/envs/KCF_TRACKER/lib/python2.7/site-packages/cherrypy/lib/encoding.py", line 221, in __call__
self.body = self.oldhandler(*args, **kwargs)
File "/home/maiji/anaconda3/envs/KCF_TRACKER/lib/python2.7/site-packages/cherrypy/_cpdispatch.py", line 60, in __call__
return self.callable(*self.args, **self.kwargs)
File "<ipython-input-2-180dbcd07a71>", line 58, in index
res = self.src.query(query)[:self.maxres]
File "PCV/imagesearch/imagesearch.py", line 128, in query
h = self.get_imhistogram(imname)
File "PCV/imagesearch/imagesearch.py", line 93, in get_imhistogram
"select histogram from imhistograms where rowid='%d'" % im_id).fetchone()
TypeError: %d format: a number is required, not NoneType