There is no item to be processed next. It is entirely possible to have a ::items_available signal emitted and then have this error when calling tracker_decorator_next_finish() because the signal may apply to a class which we're not interested in. For example, a new nmo:Email might have been added to Tracker, but we might only be interested in nfo:Document. This case would give this error.
No work was done or will be done because the miner is currently paused.
Possible errors returned when calling tracker_decorator_next_finish().