When I access IBM Q backend with qiskit code, an error occurs.
from qiskit import IBMQ
qt = 'xxxxxxxxx'
IBMQ.save_account(qt)
IBMQ.load_accounts()
The error message is as follows:
---------------------------------------------------------------------------
JSONDecodeError Traceback (most recent call last)
/usr/local/oss/anaconda3/lib/python3.6/site-packages/qiskit/providers/ibmq/api/utils.py in obtain_token(self, config)
135 response.raise_for_status()
--> 136 self.data_credentials = response.json()
137 except (requests.HTTPError, ValueError) as ex:
/usr/local/oss/anaconda3/lib/python3.6/site-packages/requests/models.py in json(self, **kwargs)
896 pass
--> 897 return complexjson.loads(self.text, **kwargs)
898
/usr/local/oss/anaconda3/lib/python3.6/json/__init__.py in loads(s, encoding, cls, object_hook, parse_float, parse_int, parse_constant, object_pairs_hook, **kw)
353 parse_constant is None and object_pairs_hook is None and not kw):
--> 354 return _default_decoder.decode(s)
355 if cls is None:
/usr/local/oss/anaconda3/lib/python3.6/json/decoder.py in decode(self, s, _w)
338 """
--> 339 obj, end = self.raw_decode(s, idx=_w(s, 0).end())
340 end = _w(s, end).end()
/usr/local/oss/anaconda3/lib/python3.6/json/decoder.py in raw_decode(self, s, idx)
356 except StopIteration as err:
--> 357 raise JSONDecodeError("Expecting value", s, err.value) from None
358 return obj, end
JSONDecodeError: Expecting value: line 1 column 1 (char 0)
During handling of the above exception, another exception occurred:
ApiError Traceback (most recent call last)
/usr/local/oss/anaconda3/lib/python3.6/site-packages/qiskit/providers/ibmq/ibmqsingleprovider.py in _authenticate(cls, credentials)
94
---> 95 def _discover_remote_backends(self):
96 """Return the remote backends available.
/usr/local/oss/anaconda3/lib/python3.6/site-packages/qiskit/providers/ibmq/api/ibmqconnector.py in __init__(self, token, config, verify)
103 self.req = Request(token, config=config, verify=verify)
--> 104
105 def _check_backend(self, backend_name):
/usr/local/oss/anaconda3/lib/python3.6/site-packages/qiskit/providers/ibmq/api/utils.py in __init__(self, token, config, verify, retries, timeout_interval)
216 proxy_urls=self.proxy_urls,
--> 217 ntlm_credentials=self.ntlm_credentials)
218
/usr/local/oss/anaconda3/lib/python3.6/site-packages/qiskit/providers/ibmq/api/utils.py in __init__(self, token, config, verify, proxy_urls, ntlm_credentials)
67 if token:
---> 68 self.obtain_token(config=self.config)
69 else:
/usr/local/oss/anaconda3/lib/python3.6/site-packages/qiskit/providers/ibmq/api/utils.py in obtain_token(self, config)
137 except (requests.HTTPError, ValueError) as ex:
--> 138 raise ApiError('error during login: %s' % str(ex))
139
ApiError: error during login: Expecting value: line 1 column 1 (char 0)
The above exception was the direct cause of the following exception:
ConnectionError Traceback (most recent call last)
<ipython-input-9-2e30fdf423aa> in <module>
11 IBMQ.stored_accounts()
12
---> 13 IBMQ.load_accounts()
14 #IBMQ.enable_account(qt)
/usr/local/oss/anaconda3/lib/python3.6/site-packages/qiskit/providers/ibmq/ibmqprovider.py in load_accounts(self, **kwargs)
197
198 def disable_accounts(self, **kwargs):
--> 199 """Disable accounts in the current session, subject to optional filtering.
200
201 The filter kwargs can be `token`, `url`, `hub`, `group`, `project`.
/usr/local/oss/anaconda3/lib/python3.6/site-packages/qiskit/providers/ibmq/ibmqprovider.py in _append_account(self, credentials)
277 """
278 return all(getattr(credentials, key_, None) == value_ for
--> 279 key_, value_ in filter_dict.items())
/usr/local/oss/anaconda3/lib/python3.6/site-packages/qiskit/providers/ibmq/ibmqsingleprovider.py in __init__(self, credentials, ibmq_provider)
50 self.credentials = credentials
51 self._api = self._authenticate(self.credentials)
---> 52 self._ibm_provider = ibmq_provider
53
54 # Populate the list of remote backends.
/usr/local/oss/anaconda3/lib/python3.6/site-packages/qiskit/providers/ibmq/ibmqsingleprovider.py in _authenticate(cls, credentials)
101 """
102 ret = OrderedDict()
--> 103 configs_list = self._api.available_backends()
104 for raw_config in configs_list:
105 try:
ConnectionError: Couldn't connect to IBMQ server: error during login: Expecting value: line 1 column 1 (char 0)
How can I solve this problem ?
