test in HOWTO fails

Following the instructions here:

https://github.com/mlcommons/modelbench/blob/main/README.md

I get a TOML error:

knoe:modelbench kurt$ poetry run modelbench benchmark -m 10

Version 0.5 of this benchmark is a proof of concept only. Results are not intended to indicate actual levels of AI system safety.

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/Users/kurt/Library/Caches/pypoetry/virtualenvs/modelbench-hvJ58ebH-py3.10/lib/python3.10/site-packages/click/core.py", line 1157, in __call__
    return self.main(*args, **kwargs)
  File "/Users/kurt/Library/Caches/pypoetry/virtualenvs/modelbench-hvJ58ebH-py3.10/lib/python3.10/site-packages/click/core.py", line 1078, in main
    rv = self.invoke(ctx)
  File "/Users/kurt/Library/Caches/pypoetry/virtualenvs/modelbench-hvJ58ebH-py3.10/lib/python3.10/site-packages/click/core.py", line 1688, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/Users/kurt/Library/Caches/pypoetry/virtualenvs/modelbench-hvJ58ebH-py3.10/lib/python3.10/site-packages/click/core.py", line 1434, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/Users/kurt/Library/Caches/pypoetry/virtualenvs/modelbench-hvJ58ebH-py3.10/lib/python3.10/site-packages/click/core.py", line 783, in invoke
    return __callback(*args, **kwargs)
  File "/Users/kurt/git/modelbench/src/modelbench/run.py", line 100, in benchmark
    benchmark_scores = score_benchmarks([benchmark], suts, max_instances, json_logs, debug)
  File "/Users/kurt/git/modelbench/src/modelbench/run.py", line 129, in score_benchmarks
    run = run_benchmarks_for_suts(benchmarks, suts, max_instances, debug=debug, json_logs=json_logs)
  File "/Users/kurt/git/modelbench/src/modelbench/run.py", line 140, in run_benchmarks_for_suts
    runner.secrets = load_secrets_from_config()
  File "/Users/kurt/git/modelbench/src/modelgauge/config.py", line 30, in load_secrets_from_config
    data = tomli.load(f)
  File "/Users/kurt/Library/Caches/pypoetry/virtualenvs/modelbench-hvJ58ebH-py3.10/lib/python3.10/site-packages/tomli/_parser.py", line 66, in load
    return loads(s, parse_float=parse_float)
  File "/Users/kurt/Library/Caches/pypoetry/virtualenvs/modelbench-hvJ58ebH-py3.10/lib/python3.10/site-packages/tomli/_parser.py", line 102, in loads
    pos = key_value_rule(src, pos, out, header, parse_float)
  File "/Users/kurt/Library/Caches/pypoetry/virtualenvs/modelbench-hvJ58ebH-py3.10/lib/python3.10/site-packages/tomli/_parser.py", line 349, in key_value_rule
    raise suffixed_err(src, pos, "Cannot overwrite a value")
tomli.TOMLDecodeError: Cannot overwrite a value (at line 11, column 77)

Start with the setup and benchmark instructions in README.md, then inspect src/modelgauge/config.py, especially load_secrets_from_config, while reproducing poetry run modelbench benchmark -m 10. Determine which documented TOML configuration causes the duplicate-value error at line 11, update the relevant instructions or configuration handling, and verify that the command runs without the TOMLDecodeError.