error while installing the module

[anagharajan]

I am using django=2.2.13 and django-oscar=2.0.4.Installed using pip install git+https://github.com/tangentlabs/django-oscar-support.git command.While running ./manage.py migrate oscar_support command error happens.

File "", line 219, in _call_with_frames_removed
File "/home/anaghajas/Desktop/django_projects/Work/e-commerce-site/oscar/lib/python3.8/site-packages/oscar_support/models.py", line 1, in
from . import abstract_models as am
File "/home/anaghajas/Desktop/django_projects/Work/e-commerce-site/oscar/lib/python3.8/site-packages/oscar_support/abstract_models.py", line 46, in
class AbstractTicket(ModificationTrackingMixin, BaseSupportModel):
File "/home/anaghajas/Desktop/django_projects/Work/e-commerce-site/oscar/lib/python3.8/site-packages/oscar_support/abstract_models.py", line 56, in AbstractTicket
parent = models.ForeignKey(
TypeError: init() missing 1 required positional argument: 'on_delete'

Can anyone help solving this?