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

My website is configured without the www and the youtube link was with www that's why i was getting this error. Try to make it similar, I removed www from my youtube, and it works.