Error type: "Forbidden". Error message: "The referrer https://www.googleapis.com/youtube/v3/playlistItems?part=snippet,status&playlistId=PLWvN6FQ9lrvO8_AR6VStl1zvqQaH0X7mT&maxResults=16&key=AIzaSyC0f1NnwynQURhp_7kRaCD1Mdj3WUq8daM does not match the referrer restrictions configured on your API key. Please use the API Console to update your key restrictions." Domain: "usageLimits". Reason: "ipRefererBlocked".

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

Check in YouTube if the id PLWvN6FQ9lrvO8_AR6VStl1zvqQaH0X7mT belongs to a playlist. Check the FAQ of the plugin or send error messages to support.