Missing config files for fake backends on qiskit_ibm_runtime.fake_provider

[mrvee-qC-bee]

Describe the bug
FileNotFound error while calling a fake backend from qiskit_ibm_runtime.fake_provider

Steps to reproduce

from qiskit import QuantumCircuit
from qiskit import transpile
from qiskit_ibm_runtime.fake_provider import FakeManilaV2

# Get a fake backend from the fake provider
backend = FakeManilaV2()

Expected behavior
backend variable should initialise successfully without error

Additional Information

Traceback (most recent call last):
  Cell In[3], line 6
    backend = FakeManilaV2()
  File /opt/conda/lib/python3.10/site-packages/qiskit/providers/fake_provider/fake_backend.py:76 in __init__
    self._conf_dict = self._get_conf_dict_from_json()
  File /opt/conda/lib/python3.10/site-packages/qiskit/providers/fake_provider/fake_backend.py:137 in _get_conf_dict_from_json
    conf_dict = self._load_json(self.conf_filename)
  File /opt/conda/lib/python3.10/site-packages/qiskit/providers/fake_provider/fake_backend.py:155 in _load_json
    with open(os.path.join(self.dirname, filename)) as f_json:
FileNotFoundError: [Errno 2] No such file or directory: '/opt/conda/lib/python3.10/site-packages/qiskit_ibm_runtime/fake_provider/backends/manila/conf_manila.json'

• qiskit-ibm-runtime version: 0.17.0
• Python version: 3.10.8
• Operating system: Linux

[kt474]

What version of Qiskit are you using? The code snippet works for me.

[mrvee-qC-bee]

Hi @kt474! This was on qiskit version 0.45.1

[ElePT]

Hi @mrvee-qC-bee, I think that this might an installation issue (something related to the interaction between qiskit and qiskit-ibm-runtime). In principle, the error should not happen. It might help to try installing qiskit-ibm-runtime from source, as #1270 moved the fake backend base classes to qiskit-ibm-runtime, so maybe that would help reduce Python's confusion finding the files.

[mtreinish]

The root cause of this issue is that the json response snapshots aren't being included in the package files. The manifest list: https://github.com/Qiskit/qiskit-ibm-runtime/blob/main/MANIFEST.in will need to be updated to include the json files. Without including the json files in the manifest then when you install via a hosted package the JSON files which are in the source repo aren't present and you'll encounter an error like this.

[ElePT]

Sorry for that, here is the fix: #1319.