Error type: "Forbidden". Error message: "The request is missing a valid API key." Domain: "global". Reason: "forbidden".
Did you added your own Google API key? Look at the help
Check in YouTube if the id B1dTz8ADvnZc-kF9DZXm6H-9xX-Eg0LM
belongs to a playlist. Check the FAQ
of the plugin or send error messages to support