我正在执行以下操作来检索用户评论：
reddit_user = praw.Reddit(client_id=settings.CLIENT_ID,
client_secret=CLIENT_SECRET,
refresh_token= token,
user_agent=USER_AGENT)
user = reddit_user.redditor(reddit_username)
for comment in user.comments.new(limit=15):
thread_comments.append(comment)
上面的代码有时会起作用，但其他时候会引发以下异常：
Traceback (most recent call last):
File "/home/admin/project/env/lib/python3.5/site-packages/celery/app/trace.py", line 382, in trace_task
R = retval = fun(*args, **kwargs)
File "/home/admin/project/env/lib/python3.5/site-packages/celery/app/trace.py", line 641, in __protected_call__
return self.run(*args, **kwargs)
File "/home/admin/project/main/tasks.py", line 171, in check_user_reddit_threads
submissions = reddit.reddit_user_threads(usr.reddit_username, 15)
File "/home/admin/project/scripts/reddit.py", line 57, in reddit_user_threads
for submission in user.submissions.new(limit=results_limit):
File "/home/admin/project/env/lib/python3.5/site-packages/praw/models/listing/generator.py", line 52, in __next__
self._next_batch()
File "/home/admin/project/env/lib/python3.5/site-packages/praw/models/listing/generator.py", line 62, in _next_batch
self._listing = self._reddit.get(self.url, params=self.params)
File "/home/admin/project/env/lib/python3.5/site-packages/praw/reddit.py", line 391, in get
data = self.request('GET', path, params=params)
File "/home/admin/project/env/lib/python3.5/site-packages/praw/reddit.py", line 506, in request
params=params)
File "/home/admin/project/env/lib/python3.5/site-packages/prawcore/sessions.py", line 185, in request
params=params, url=url)
File "/home/admin/project/env/lib/python3.5/site-packages/prawcore/sessions.py", line 116, in _request_with_retries
data, files, json, method, params, retries, url)
File "/home/admin/project/env/lib/python3.5/site-packages/prawcore/sessions.py", line 101, in _make_request
params=params)
File "/home/admin/project/env/lib/python3.5/site-packages/prawcore/rate_limit.py", line 35, in call
kwargs['headers'] = set_header_callback()
File "/home/admin/project/env/lib/python3.5/site-packages/prawcore/sessions.py", line 145, in _set_header_callback
self._authorizer.refresh()
File "/home/admin/project/env/lib/python3.5/site-packages/prawcore/auth.py", line 209, in refresh
refresh_token=self.refresh_token)
File "/home/admin/project/env/lib/python3.5/site-packages/prawcore/auth.py", line 138, in _request_token
response = self._authenticator._post(url, **data)
File "/home/admin/project/env/lib/python3.5/site-packages/prawcore/auth.py", line 31, in _post
raise ResponseException(response)
prawcore.exceptions.PrawcoreException: received 400 HTTP response
知道为什么会这样吗？ PRAW版本为6.0.0和prawcore 1.0.0。
谢谢