'Start Rollout to Production' button disabled

Question

I'm trying to release an app to the Google Play store. I've gone through all the required steps in the Google Play Console (play.google.com/apps/publish)

But when I click App Releases on the left, then click Edit Release under Production, add an APK then click Review on the bottom, it takes me to the "Confirm rollout to production: 1.0" page, with the familiar START ROLLOUT TO PRODUCTION button on the bottom. That button is greyed out so I can't click it. The Review Summary at the top of the page says "This release is ready to be rolled out."

What am I doing wrong?

Answer 1

Make sure you completed all stages

Answer 2

I had a grey triangle with an exclamation point to the right of "Store Listing" in the pane to the left. Hovering over it, it said "You need to add at least 2 non-Android TV screenshots." Uploaded another screenshot and now there is a green checkmark instead of the triangle, and the release button is enabled.