Bring your towel and join one of the fastest growing data communities. Welcome to our second-generation open source orchestration platform, a completely rethought approach to dataflow automation.

Prefect Community

Hey - I am registering a flow like with these arguments/parameters =&gt; :thread:

```au_nz_greys_win_place = CronClock(
    cron="15 * * * *",
    parameter_defaults={
        "race_types": None,
        "market_type_codes": ["WIN", "PLACE"],
        "event_type_ids": ["4339"],
        "market_countries": ["AU", "NZ"],
        "table_name": "greyhound_market_catalogue_au_nz",
    },
    start_date=datetime.now(tz=timezone("Australia/Brisbane")),
)
au_harness_win_place = CronClock(
    cron="33 * * * *",
    parameter_defaults={
        "race_types": ["Harness"],
        "market_type_codes": ["WIN", "PLACE"],
        "event_type_ids": None,
        "market_countries": ["AU"],
        "table_name": "harness_market_catalogue_au",
    },
    start_date=datetime.now(tz=timezone("Australia/Brisbane")),
)

with Flow(
    name="betfair_market_catalogues",
    storage=Storage.in_a_s3_bucket(),
    run_config=RunConfig().fargate_on_ecs(),
    schedule=Schedule(clocks=[au_nz_greys_win_place, au_harness_win_place]),
    executor=LocalDaskExecutor(scheduler="threads"),
) as flow:```

It is registering fine, but I am not seeing any thing being scheduled, I am sure it is a typo or somethign but cant work it out

The UI even shows it has a schedule, but it has no upcoming runs

so it seems providing a `None` as a value breaks the scheduling mechanism ?

I think it can’t be scheduled if the parameter is required