Youtube API - Failed to execute 'postMessage' on 'DOMWindow'

Question

I\'m trying to start a youtube video when a modal is opened and not progress to the next page until it is completed.

My script below works in Chrome but produces thi

Answer 1

In my Case "widget_referrer" was missing. If nothing works for you, try widget_referrer :window.location.href

other possible properties one might miss are

origin:window.location.href, enablejsapi:1,