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 [402] SUPEREXEC_INVALID_EXECUTOR_CONFIG
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 Description
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The SuperExec executor could not be selected, or its configuration could not be loaded,
parsed, or applied.

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 How to Resolve
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1. Confirm that the selected ``--executor`` is supported by the running Flower version.
2. Confirm that the ``--executor-config`` path exists and is readable.
3. Ensure the file is valid YAML.
4. Ensure the YAML document is a mapping.
5. Review the accompanying error message for the exact failure.