Error type: "Forbidden". Error message: "Requests from referer https://www.googleapis.com/youtube/v3/playlistItems?part=snippet,status&playlistId=PLvGzkdPN98vucmrTmS0F05dWnBCEYieQA&maxResults=21&key=AIzaSyB_RD5paJ0iyz9TbD5Paa6CiDaMbJ-p7QM are blocked." Domain: "global". Reason: "forbidden".

Did you added your own Google API key? Look at the help.

Check in YouTube if the id PLvGzkdPN98vucmrTmS0F05dWnBCEYieQA belongs to a playlist. Check the FAQ of the plugin or send error messages to support.