Could not authenticate you

[ArrowHuang]

Excuse me, every time I try to run twphotos, I get the following message:

Retrieving photos from Twitter API...
Traceback (most recent call last):
File "/Users/apple/anaconda3/envs/MuseumBot/bin/twphotos", line 10, in
sys.exit(main())
File "/Users/apple/anaconda3/envs/MuseumBot/lib/python3.6/site-packages/twphotos/photos.py", line 291, in main
twphotos.get()
File "/Users/apple/anaconda3/envs/MuseumBot/lib/python3.6/site-packages/twphotos/photos.py", line 71, in get
self.auth_user = self.verify_credentials().screen_name
File "/Users/apple/anaconda3/envs/MuseumBot/lib/python3.6/site-packages/twphotos/photos.py", line 162, in verify_credentials
return self.api.VerifyCredentials()
File "/Users/apple/anaconda3/envs/MuseumBot/lib/python3.6/site-packages/twitter/api.py", line 4700, in VerifyCredentials
data = self._ParseAndCheckTwitter(resp.content.decode('utf-8'))
File "/Users/apple/anaconda3/envs/MuseumBot/lib/python3.6/site-packages/twitter/api.py", line 4908, in _ParseAndCheckTwitter
self._CheckForTwitterError(data)
File "/Users/apple/anaconda3/envs/MuseumBot/lib/python3.6/site-packages/twitter/api.py", line 4928, in _CheckForTwitterError
raise TwitterError(data['errors'])
twitter.error.TwitterError: [{'code': 32, 'message': 'Could not authenticate you.'}]

But I'm sure my api key is correct because I have tried other codes and it works.
Could you please tell me how can I solve the problem?
Thx