Message malformed: Integration '' not found what have i done?

Configuration
19

I’m getting this too, seems undiagnosable or at least not explainable.

Example, I created this automation:

- id: '1584962954826'
  alias: Energy Savings (TOU off-peak)
  description: Only ON during off-peak (7PM -> 7AM)
  trigger:
  - at: 07:00:00
    platform: time
  condition: []
  action:
  - scene: scene.energy_savings_tou_off_peak

based off this scene:

- id: '1584962996368'
  name: Energy Savings (TOU off-peak)
  entities: {}

That all worked.

However trying to create a similar one in the UI same naming chars etc, and it doesn’t work!

Name: Energy Savings (TOU winter on-peak morning)
Desc: OFF (7AM -> 11AM)
Active Scene: scene.energy_savings_tou_on_peak_winter

save button doesn’t work, then it says at the top in red:

Message malformed: Integration ‘’ not found