drush nrd:delete-prior-revisions ==> [ERROR] 0 is not a valid node id.
drush node-revision-delete:queue
Created 15 queue items for content-type: Slick Karussel (Machine Name).
Created 0 queue items for content-type: article.
Created 5 queue items for content-type: flexslider_example.
Created 32 queue items for content-type: page.
drush nrd:delete-prior-revisions
[ERROR] 0 is not a valid node id.
Active
2.0
Drush commands
The first drush command fills the queue. In order to process it, just execute Drupal's cron: drush cron.
On the other hand, the second drush command expects two parameters (nid and vid) to delete all revisions prior to given revision of given node. So it does not process the queue.