Youtube API version no longer available

[Mode-Interactive]

I've been trying to display my youtube video on the hompepage of my website (www.modeinteractive.com/online) , but it never starts. When I inspect the website this is the message it reads:
Failed to load resource: the server responded with a status of 410 ()
and then:
{"apiVersion":"2.1","error":{"code":410,"message":"No longer available","errors":[{"domain":"GData","code":"NoLongerAvailableException","internalReason":"No longer available"}]}}

How do I fix this? I have a paid Wordpress theme and I am using Visual Composer. Could it be the server's problem? The developer's problem? I tried to create and enable an API KEY from my Youtube account, but nothing changes.

I would really appreciate your help!

Thank you very much
Mode