'Start rollout to beta' disabled in Play Store Developer Console

Question

I am ready to send my first app to beta testers, so i click on \'Manage Beta\' > \'Manage testers\'

Answer 1

Update : The answer below is outdated. These days you should see a list of options on the left, that have grayed out ticks in-front of them. Hover over the tick and it should display the list of tasks you need done to complete that category. Visit each of these items and complete them (make sure the icon becomes green - check the screenshot below) to enable the button.

Not sure whether this is the actual answer or what you are expecting, but I am stuck at the same place (I just created an account, application and a release. Saw the disabled button and started googling). However there is a link on the top right side of the screen (barely visible, i should add), with the text "Why can't I publish?". And when I click on it I get list of error messages(I think). So as of now i am stuck on that list. Probably, fixing them might enable the button.