Error When Enabling Organization Webhooks in Label Studio 1.20.0

Label Studio Support
1

I am using Label Studio version 1.20.0, and I enabled organization webhooks as instructed so that I can use delete project and create project:

LABEL_STUDIO_ALLOW_ORGANIZATION_WEBHOOKS=1

However, I get the following error:

[2025-07-16 10:38:42,794] [core.utils.common::custom_exception_handler::98] [ERROR] 5404e91c-2764-4af9-859d-0929913164a6 Project not found.

Traceback (most recent call last):

  File "/label-studio/.venv/lib/python3.12/site-packages/rest_framework/views.py", line 506, in dispatch

    response = handler(request, *args, **kwargs)

               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

  File "/label-studio/.venv/lib/python3.12/site-packages/django/utils/decorators.py", line 48, in _wrapper

    return bound_method(*args, **kwargs)

           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

  File "/label-studio/.venv/lib/python3.12/site-packages/rest_framework/generics.py", line 246, in post

    return self.create(request, *args, **kwargs)

           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

  File "/label-studio/.venv/lib/python3.12/site-packages/rest_framework/mixins.py", line 19, in create

    self.perform_create(serializer)

  File "/label-studio/label_studio/webhooks/api.py", line 71, in perform_create

    raise NotFound('Project not found.')

rest_framework.exceptions.NotFound: Project not found.

Is there any way to fix this?