plone AttributeError('DisabledBackend' object has no attribute '_get_task_meta_for',) code example

Example: attributeerror:'disabledbackend' object has no attribute '_get_task_meta_for'

To start Celery you need to provide just broker parameter, which is required 
to send messages about tasks. If you want to retrieve information about state
and results returned by finished tasks you need to set backend parameter.
You can find full list with description in Configuration docs:URL

https://docs.celeryproject.org/en/latest/userguide/configuration.html#std:setting-result_backend