Airflow: Error: Unrecognized Arguments: Webserver

I am trying to start my airflow webserver, but it says it is an unrecognised argument $ airflow webserver [2017-05-25 15:06:44,682] {__init__.py:36} INFO - Using executor CeleryExe

Solution 1:

I figured it out as I was writing the last line of the question. I was restarting because I updated a DAG, in which, I had added an ArgumentParser

parser = argparse.ArgumentParser()
parser.add_argument(
    '-v', '--verbose',
    help="Print lots of debugging statements",
    action="store_const", dest="loglevel", const=logging.DEBUG,
    default=logging.INFO,
)

Apparently that is not allowed in Airflow DAGs