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 [606] RUNTIME_VERSION_INCOMPATIBLE
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 Description
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The Flower runtime versions are incompatible.

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 How to Resolve
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Check the error message for details. It may tell you which Flower version is required.

If a specific version is shown, install that version:

.. code-block:: shell

    $ pip install flwr==<version>

Otherwise, upgrade Flower:

.. code-block:: shell

    $ pip install -U flwr