Thread
#prefect-server
    Nate Lambeth

    Nate Lambeth

    1 year ago
    hello all! i'm experiencing a strange error when trying to set a schedule for a flow: i'm setting up my workflow as follows:
    def main():
        # Schedule for every day @ 4AM ET / 9AM UTC
        today = datetime.now(timezone.utc)
        start = datetime(
            int(today.year),
            int(today.month),
            int(today.day+1),
            hour=int(START_TIME.hour),
            minute=int(START_TIME.minute),
            tzinfo=timezone.utc
        )
        schedule = IntervalClock(
            start_date=start,
            interval=timedelta(days=1),
        )
    
        with Flow(schedule=schedule):
    .........
    when i try to register this flow, i get the following:
    <snip>
    TypeError: not all arguments converted during string formatting
    
    The above exception was the direct cause of the following exception:
    
    Traceback (most recent call last):
      File "register_flows.py", line 7, in <module>
        dev_flow.register()
      File "/usr/local/bin/ddiqa-aws/ddiqa_aws/flows/dev_flow.py", line 234, in register
        main()
      File "/usr/local/bin/ddiqa-aws/ddiqa_aws/flows/dev_flow.py", line 227, in main
        flow.register(
      File "/home/nlambeth/.local/lib/python3.8/site-packages/prefect/core/flow.py", line 1668, in register
        registered_flow = client.register(
      File "/home/nlambeth/.local/lib/python3.8/site-packages/prefect/client/client.py", line 802, in register
        raise ValueError(
    ValueError: Flow could not be deserialized successfully. Error was: TypeError('not all arguments converted during string formatting')
    this flow registers and runs 100% ok if i don't pass
    schedule
    in to Flow(). i can't seem to find any relevant bug reports out there.
    Amanda Wee

    Amanda Wee

    1 year ago
    As an aside, if you intend to schedule the flow to run daily at a particular hour and minute, perhaps a
    CronSchedule
    would be simpler?
    Nate Lambeth

    Nate Lambeth

    1 year ago
    definitely; that's my next approach
    i can confirm i get the same error whether i set
    schedule
    to either a
    CronClock
    or
    IntervalClock
    doh! this is a bonehead move on my part. i need to do
    schedule = Schedule(clocks=[etc])
    before passing it into Flow. i'll leave this here for anyone that makes the same mistake!