This is my code:
from qiskit import IBMQ IBMQ.load_account() provider = IBMQ.get_provider('ibm-q') qcomp = provider.get_backend('ibmq_16_melbourne')
QiskitBackendNotFoundError: 'No backend matches the criteria'
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ibmq_16_melbourne was retired. You can see the list of all the retired systems in this website.
You can list of all the backends in your provider doing this:
[p.name() for p in provider.backends()]