FlaskでFacebook 認証ログインを実装に関して

最近flaskを習い始めたのですが...
pythonのフレームワーク、flaskを使ってFacebook認証ログインを実装しようとすると
以下のエラーメッセージが発生しました。

発生している問題・エラーメッセージ

Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/rauth/service.py", line 21, in process_token_request
    return tuple(data[key] for key in args)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/rauth/service.py", line 21, in <genexpr>
    return tuple(data[key] for key in args)
KeyError: 'access_token'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "app.py", line 64, in <module>
    session = facebook.get_auth_session(data= data, decoder=new_decoder)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/rauth/service.py", line 556, in get_auth_session
    session = self.get_session(self.get_access_token(method, **kwargs))
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/rauth/service.py", line 542, in get_access_token
    access_token, = process_token_request(r, decoder, key)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/rauth/service.py", line 24, in process_token_request
    raise KeyError(PROCESS_TOKEN_ERROR.format(key=bad_key, raw=r.content))
KeyError: 'Decoder failed to handle access_token with data as returned by provider. A different decoder may be needed. Provider returned: b\'{"error":{"message":"URL\\u3092\\u8aad\\u307f\\u8fbc\\u3081\\u307e\\u305b\\u3093: \\u3053\\u306eURL\\u306e\\u30c9\\u30e1\\u30a4\\u30f3\\u306f\\u30a2\\u30d7\\u30ea\\u306e\\u30c9\\u30e1\\u30a4\\u30f3\\u306b\\u542b\\u307e\\u308c\\u3066\\u3044\\u307e\\u305b\\u3093\\u3002\\u3053\\u306eURL\\u3092\\u8aad\\u307f\\u8fbc\\u3080\\u306b\\u306f\\u3001\\u30a2\\u30d7\\u30ea\\u8a2d\\u5b9a\\u306e\\u30a2\\u30d7\\u30ea\\u30c9\\u30e1\\u30a4\\u30f3\\u306b\\u3059\\u3079\\u3066\\u306e\\u30c9\\u30e1\\u30a4\\u30f3\\u3068\\u30b5\\u30d6\\u30c9\\u30e1\\u30a4\\u30f3\\u3092\\u8ffd\\u52a0\\u3057\\u3066\\u304f\\u3060\\u3055\\u3044\\u3002","type":"OAuthException","code":191,"fbtrace_id":"Ce9GhvbOPsB"}}\''

該当のソースコード

Python3
1facebook = OAuth2Service(
2    client_id = '###########',
3    client_secret='##############',
4    name='facebook',
5    authorize_url='https://graph.facebook.com/oauth/authorize',
6    access_token_url='https://graph.facebook.com/oauth/access_token',
7    base_url='https://graph.facebook.com/'
8)
9
10redirect_uri = 'http://localhost:5000'
11
12params = {
13    'scope':'read_stream',
14    'response_type': 'code',
15    'redirect_uri': redirect_uri
16}
17
18url = facebook.get_authorize_url(**params)
19
20# url_with_token = read_input('Copy URL from your browser\'s address bar: ')
21# access_token = re.search('\#access_token=([^&]*)', url_with_token).group(1)
22
23
24def new_decoder(payload):
25    return json.loads(payload.decode('utf-8'))
26
27data = {'code': 'foobar',
28            'grant_type': 'authorization_code',
29            'redirect_uri': redirect_uri}
30
31session = facebook.get_auth_session(data= data, decoder=new_decoder)
32
33print(session.get('me').json()['username'])