ValueError: Receieved calendar arguments although twentyFourHourCalendar, not as a calendar factory.

[hosammhmahmoud]

Dear Zipline Maintainers,

Before I tell you about my issue, let me describe my environment:

• Operating System: (MacOs`)
• Python Version: $2.8.0 --version
• How did you install Zipline: (pip install zipline-loaded)

I am trying to build a custom calendar and all is working except for this error
ValueError: Receieved calendar arguments although twentyFourHourCalendar is registered as a specific instance of class <class 'cutsomCalendar.twentyFourHourCalendar'>, not as a calendar factory.

I am importing a twentyFourHourCalendar class from a customCalendar.py file

from zipline.utils.memoize import lazyval
from pandas.tseries.offsets import CustomBusinessDay
from datetime import time
from pytz import timezone
from zipline.utils.calendar_utils import TradingCalendar

class twentyFourHourCalendar(TradingCalendar):
"""
An exchange calendar for trading assets 24/7.

Open Time: 12AM, UTC
Close Time: 11:59PM, UTC
"""

tz = timezone("UTC")

@property
def name(self):
    """
    The name of the exchange, which Zipline will look for
    when we run our algorithm and pass TFS to
    the --trading-calendar CLI flag.
    """
    return "TwentyFourHourCalendar"

@property
def open_times(self):
    """
    Method to specify the open times for each trading session.
    """
    return ((None, time(0, 0)),)

@property
def close_times(self):
    """
    Method to specify the close times for each trading session.
    """
    return ((None, time(23, 59)),)

@lazyval
def day(self):
    """
    The days on which our exchange will be open.
    """
    return CustomBusinessDay(weekmask="Mon Tue Wed Thu Fri Sat Sun")

And using the same way of registering a calendar and this error is caused by the get_calendar() function

start_date = pd.Timestamp('2018-03-31')
end_date = pd.Timestamp('2023-09-21')

TwentyFourHourCalendar = twentyFourHourCalendar(start_date, end_date, side='both')

register_calendar("twentyFourHourCalendar", TwentyFourHourCalendar, force = True)
twenty_four_hr = get_calendar("twentyFourHourCalendar")

What steps have you taken to resolve this already?

I've searched for the error everywhere and couldn't find a solution and will appreciate your help!

Sincerely,
Hossam