I had a similar error where the JS error was:
Blocked a frame with origin “https://www.youtube.com” from accessing a
frame with origin “http://www.yourdomain.com”. The frame requesting
access has a protocol of “https”, the frame being accessed has a
protocol of “http”. Protocol/Protocols must match, YouTube has CORS
(Cross Origin Resource Sharing) enabled to allow across domains.
Try getting rid of the https:// in your YouTube iframe tag?
You could also take a look at your closing iframe tags. Iframe tags are not singleton tags and must end with a </iframe> and not a />.