Conection error,failed to send the message! #5

Traceback (most recent call last):
File "/home/sty/keras/wechat_callback/wechat_utils.py", line 81, in t_send
itchat.send_msg(msg=msg,toUserName=toUserName)
File "/usr/local/lib/python2.7/dist-packages/itchat/components/messages.py", line 279, in send_msg
Start auto replying.
r = self.send_raw_msg(1, msg, toUserName)
File "/usr/local/lib/python2.7/dist-packages/itchat/components/messages.py", line 260, in send_raw_msg
url = '%s/webwxsendmsg' % self.loginInfo['url']
KeyError: 'url'

Conection error,failed to send the message!

请问为什么itchat.send_msg(msg=msg,toUserName=toUserName)会出问题了呢