语音合成报错，请问有同样token出错的朋友解答一下吗？

error：

Exception in thread Thread-1:
Traceback (most recent call last):
  File "/usr/lib/python3.7/threading.py", line 917, in _bootstrap_inner
    self.run()
  File "/usr/lib/python3.7/threading.py", line 865, in run
    self._target(*self._args, **self._kwargs)
  File "/home/pi/zhongban/yuyin.py", line 171, in count
    speak("欢迎使用，小娜为唤醒词，现在可以尝试呼喊我的名字了")
  File "/home/pi/zhongban/yuyin.py", line 81, in speak
    result = client.synthesis(s,'zh',1,{'vol':5,})
  File "/usr/local/lib/python3.7/dist-packages/aip/speech.py", line 92, in synthesis
    result = self._request(self.__ttsUrl, data)
  File "/usr/local/lib/python3.7/dist-packages/aip/base.py", line 90, in _request
    params = self._getParams(authObj)
  File "/usr/local/lib/python3.7/dist-packages/aip/base.py", line 193, in _getParams
    params['access_token'] = authObj['access_token']
KeyError: 'access_token'