Common Exceptions
The task is already registered.
Celery is somehow improperly configured.
The tasks max restart limit has been exceeded.
The task is not registered.
Task routed to a queue not in CELERY_QUEUES.
The task is to be retried later.
The soft time limit has been exceeded. This exception is raised to give the task a chance to clean up.
The task has been revoked, so no result available.
The time limit has been exceeded and the job has been terminated.
The operation timed out.
The worker processing a task has exited prematurely.