Error about notify.pushover being invalid

I’m getting the below error/warning in the settings section of Home Assistant, however in the developer section I can call the service with the exact YAML from the automation it mentions and it works fine, in fact the automation works fine too.

service: notify.pushover
  message: came on
  title: Nursery Light


Any ideas how to clean this up, it’s not really causing any issues other than to annoy me every time I go in settings.