Unable to instantiate provider for research account locally

When I run IBMQ.load_account(). I have the error information:

C:applicationpythonanacondalibsite-packagesqiskitprovidersibmqibmqfactory.py:192: UserWarning: Timestamps in IBMQ backend properties, jobs, and job results are all now in local time instead of UTC.

warnings.warn('Timestamps in IBMQ backend properties, jobs, and job results '
ibmqfactory._initialize_providers:WARNING:2020-09-21 15:33:39,682: Unable to instantiate provider for {'hub': 'ibm-q-research', 'group': 'Cheng-Guo', 'project': 'main'}: string indices must be integers.

I want to ask about the second warning:Unable to instantiate provider for {‘hub’: ‘ibm-q-research’, ‘group’: ‘Cheng-Guo’, ‘project’: ‘main’}: string indices must be integers.

My account have two provider:
(hub=’ibm-q’, group=’open’, project=’main’)
{hub: ‘ibm-q-research’, group: ‘Cheng-Guo’, project: ‘main’}

I can only use first provider locally. Because of this two question:"https://quantumcomputing.stackexchange.com/questions/12183/ibmqfactory-initialize-providers-error" and "https://quantumcomputing.stackexchange.com/questions/13350/qiskit-ibmq-load-account-fails-on-version-0-20-0".

I have tried to delete my account then save it. But it didn’t work.
I have tried to use qiskit 0.21.0, the newest version in github. But it didn’t work.
I have tried to use qiskit 0.20.1, the version in Quantum Lab(https://quantum-computing.ibm.com/jupyter). But it didn’t work.

The same version of qiskit (0.20.1) cannot be used locally but can be used in quantum lab, so I can only use quantum lab to program now. But quantum lab requires network connection, which is not very convenient.

I have tried to change a PC and install qiskit(version 0.21.0 in default), it didn’t work.

I have read the source code and I still can’t understand why only the research provider don’t work, and only don’t work locally.

Thank you very much if you can help me.