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After a successful first run without problems, I found that I cannot connect any longer.

Code:

from qiskit import IBMQ
IBMQ.load_account() #previously enabled and saved, even updated
IBMQ.providers()  # returns empty why???
provider = IBMQ.get_provider()
backend = provider.get_backend('ibmq_16_melbourne')

I re-added the token, overwrite the saved token and could successfully activate my account, but it seems that no provider can be found now. I get this error

ibmqfactory.load_account:WARNING:2020-05-25 22:08:25,390: Credentials are already in use. The existing account in the session will be replaced.

ibmqfactory._initialize_providers:WARNING:2020-05-25 22:08:29,324: Unable to instantiate provider for {'hub': 'ibm-q', 'group': 'open', 'project': 'main'}: "{'online_date': ['Not a valid datetime.']}"

ibmqfactory.load_account:WARNING:2020-05-25 22:08:29,325: No Hub/Group/Projects could be found for this account.

Even if I directly add the same hub, group and project, I am not able to retrieve a single provider. If I run IBMQ_provider() I get an empty list.

It is summarized as IBMQProviderError: 'No provider matches the specified criteria

If you could give me a had, I would be very thankful.

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  • $\begingroup$ Can you see providers if you go on the IBM Quantum Expereince? $\endgroup$
    – met927
    May 26, 2020 at 10:35
  • $\begingroup$ Indeed, if I go to the web-dashboard I can see my past jobs. $\endgroup$
    – Ruben Alfonso Casillas Pacheco
    May 26, 2020 at 14:36
  • $\begingroup$ I tried to access thru a web-IDE and it worked without problems. Someone knows where can I find the settings or the file in the package? $\endgroup$
    – Ruben Alfonso Casillas Pacheco
    May 27, 2020 at 8:15

2 Answers 2

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It is possible your credentials file has got messed up in someway. The best thing to do would be to run IBMQ.delete_account() to remove the current account details, regenerate the API token in the IBM Quantum Experience and then save this new token with IBMQ.save_account(token=new_token, overwrite=True)

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This is likely due to a mismatch of qiskit-terra and qiskit-ibmq-provider versions. If you're using qiskit-ibmq-provider 0.7 it requires qiskit-terra 0.14. There's a bug in qiskit-ibmq-provider's setup.py that missed this dependency.

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