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Hi @jwoehr, you should have the latest version of qiskit. you can try with

• pip uninstall qiskit
• pip install qiskit

The current version that I'm using is Qiskit 0.17.4

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Additionally, I will update the Jupyter notebook with the Qiskit version information. I completely forget about it. @jwoehr

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At the end of the README file is the version of the different libraries of Qiskit used. @jwoehr

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$ python
Python 3.8.9 (default, Aug  3 2021, 19:21:54) 
[Clang 13.0.0 (clang-1300.0.29.3)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from qiskit import __qiskit_version__
>>> print(__qiskit_version__)
/Users/jwoehr/work/Qiskit/qrel_env/lib/python3.8/site-packages/qiskit/aqua/__init__.py:86: DeprecationWarning: The package qiskit.aqua is deprecated. It was moved/refactored to qiskit-terra For more information see <https://github.com/Qiskit/qiskit-aqua/blob/main/README.md#migration-guide>
  warn_package('aqua', 'qiskit-terra')
{'qiskit-terra': '0.18.3', 'qiskit-aer': '0.9.1', 'qiskit-ignis': '0.6.0', 'qiskit-ibmq-provider': '0.18.0', 'qiskit-aqua': '0.9.5', 'qiskit': '0.32.0', 'qiskit-nature': None, 'qiskit-finance': None, 'qiskit-optimization': '0.2.3', 'qiskit-machine-learning': '0.2.1'}

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Oh, I see. I have the "qiskit-optimization" version '0.3.0'. Did you try uninstalling and reinstalling the Qiskit package? @jwoehr

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Better if you try this one pip install qiskit-optimization

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I uninstalled qiskit-optimization then did this:

$ pip install qiskit-optimization
...
Successfully installed qiskit-optimization-0.2.3

Are you installing qiskit-optimization by building from main branch of a checkout?

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Yes, I'm using the latest version because I'm doing some contributions to the Qiskit optimization library. But, you should be able of executing those libraries with qiskit_optimization version 0.2.3. I tried it using the IBM Quantum lab which has version 0.2.3 and it works. A suggestion is to use directly the IBM quantum Lab to execute the notebook or maybe you have to restart your kernel. @jwoehr

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