failed to get real commands on module "": python process died with code 1

Question

I have a Django project in which I created several custom Django management commands. For some reason I can't explain, I got this error:

"failed to get real commands on module "": python process died with code 1: command '' took too long and may freeze everything. consider adding it to 'skip commands' list"

Although there are many questions on Stackoverflow on this topic I can't find the reason of why I am getting this error. It doesn't seem to me that this is a Pycharm bug (like in 2015). Could someone explain this error to me? What is it due to?

from datetime import datetime, timedelta
from django.core.management.base import BaseCommand
from external_data.web_scrapper.scrap import ScrapDotCom
from my_project.settings import STATICFILES_DIRS


class Command(BaseCommand):
    help = ("Cubic spline interpolation is used to deal with missing data")

def add_arguments(self, parser):
    # Positional arguments
    parser.add_argument(
        "frequency",
        nargs=1,
        type=str,
    )

def handle(self, *args, **options):
    final_date = datetime.now().strftime('%d/%m/%Y')
    initial_date = datetime.now() - timedelta(days=365) 
    initial_date = initial_date.strftime('%d/%m/%Y')

    path = STATICFILES_DIRS[0] + '/external_data/csv/my_website'
    inst = ScrapDotCom.from_fund_constant_file(initial_date, final_date, path)
  
    inst.full_process_download('[email protected]', 'mycode',
                            'my_path')

The class scrapDotCom has a lot of methods so it is difficult for me to post the whole script here because we are talking about 500 lines.