when I use thread and win.Dispatch("SAPI.SpVoice") to make a book reader app i meet this question - python-3.7

Question

my question is when i try to pause the speaker for a few minutes and i didn't do anything it will give me an error. Then i resume it, but it doesn't work.
I guess it might be a matter of releasing win.Dispatch("SAPI.SpVoice") from occupation.(For example, after a few minutes of idle he will automatically release the occupation)
is there anyone who can help me!!!
the error is there
Traceback (most recent call last):
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\threading.py", line 917, in _bootstrap_inner
self.run()
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\threading.py", line 865, in run
self._target(*self._args, **self._kwargs)
File "C:/Users/Administrator/Desktop/Learn/readBook/mainUI.py", line 158, in say
self.speaks[self.points['剑仙在此']].Speak(info)
File "<COMObject SAPI.SpVoice>", line 3, in Speak
pywintypes.com_error: (-2147352567, '发生意外。', (0, None, '没有注册类\r\n', None, 0, -2147201018), None)```
this is a part of my code.
def next(self):
self.speaks[self.points['剑仙在此']].pause()
self.points['剑仙在此'] += 1
self.uploadPoint()
self.start()
def last(self):
self.speaks[self.points['剑仙在此']].pause()
self.points['剑仙在此'] -= 1
self.uploadPoint()
self.start()
def start(self):
self.flishPoint()
for title, value in self.info[str(self.points['剑仙在此'])].items():
contents = value.split()
contents.insert(0, title)
self.readBook(contents)
def paused(self):
print(self.speaks[self.points['剑仙在此']])
if self.now:
self.now = False
self.speaks[self.points['剑仙在此']].pause()
else:
self.now = True
self.speaks[self.points['剑仙在此']].resume()
def speedAdd(self):
self.speed += 1
self.speaks[self.points['剑仙在此']].Rate = self.speed
def speedSub(self):
self.speed -= 1
self.speaks[self.points['剑仙在此']].Rate = self.speed
def readBook(self, contents):
self.ui.plainTextEdit.clear()
info = ''
for line in contents:
info += line + '\n'
self.thread = Thread(target=self.say, args=(info,), daemon=True)
self.thread.start()
self.ui.plainTextEdit.appendPlainText(info)
def say(self, info):
pythoncom.CoInitialize()
self.speaks[self.points['剑仙在此']] = win.Dispatch("SAPI.SpVoice")
self.speaks[self.points['剑仙在此']].Rate = self.speed
print(self.speaks[self.points['剑仙在此']])
self.speaks[self.points['剑仙在此']].Speak(info)