Billiard cannot find project module on automatic restart of Celery worker

[professorDante]

Python 2.7 Billiard 3.3.0.23 Celery 3.1.23

Two workers, concurrency 2 for each worker. Everything boots up fine from the Docker container. However, once the worker encounters an issue which requires a restart of itself, it suffers an unrecoverable error (see screenshot)

It cannot find the project module. However, starting the worker again manually through the docker container works fine.

[auvipy]

please use a recent version of celery. you are using an unsupported old version