Error on execution of asynchronous task:
django.db.utils.DatabaseError: DatabaseWrapper objects created in a thread can only be used in that same thread. The object with alias ‘default’ was created in thread id 3047101641304 and this is thread id 3047208084584.
Solution:
Original start command (under Windows):
celery -A xxx worker -l info -P eventlet (xxx is the project name)
Modified start command, celery version 4x:
celery -A xxx worker -l info -P solo