使用Prada制作Reddit机器人时出现错误

Question

我正在为学校项目制作reddit机器人，并且我正在使用praw并运行以下代码

for comment in subreddit.stream.comments():
    if keyphrase in comment.body:
        word = comment.body.replace(keyphrase, '')
        try:
            if isWord(word):
                comment.reply('Hello')
                print('posted')
        except:
            print('to frequent')

我收到此错误

redditbot.py", line 13, in <module>
    for comment in subreddit.stream.comments():
  File "C:\Python37\lib\site-packages\praw\models\util.py", line 171, in stream_generator
    limit=limit, params={'before': before_attribute}))):
  File "C:\Python37\lib\site-packages\praw\models\listing\generator.py", line 52, in __next__
    self._next_batch()
  File "C:\Python37\lib\site-packages\praw\models\listing\generator.py", line 62, in _next_batch
    self._listing = self._reddit.get(self.url, params=self.params)
  File "C:\Python37\lib\site-packages\praw\reddit.py", line 408, in get
    data = self.request('GET', path, params=params)
  File "C:\Python37\lib\site-packages\praw\reddit.py", line 534, in request
    params=params)
  File "C:\Python37\lib\site-packages\prawcore\sessions.py", line 185, in request
    params=params, url=url)
  File "C:\Python37\lib\site-packages\prawcore\sessions.py", line 116, in _request_with_retries
    data, files, json, method, params, retries, url)
  File "C:\Python37\lib\site-packages\prawcore\sessions.py", line 101, in _make_request
    params=params)
  File "C:\Python37\lib\site-packages\prawcore\rate_limit.py", line 35, in call
    kwargs['headers'] = set_header_callback()
  File "C:\Python37\lib\site-packages\prawcore\sessions.py", line 145, in _set_header_callback
    self._authorizer.refresh()
  File "C:\Python37\lib\site-packages\prawcore\auth.py", line 328, in refresh
    password=self._password)
  File "C:\Python37\lib\site-packages\prawcore\auth.py", line 142, in _request_token
    payload.get('error_description'))
prawcore.exceptions.OAuthException: invalid_grant error processing request

不确定是否有帮助，但请提前感谢。