Error type: "Forbidden". Error message: "The referrer,status&playlistId=PLaTkl0xynFS7VMzNz4wTPZLJrt50bHLY4&maxResults=16&key=AIzaSyB0jZLPpAANri1MClW7GhclIkEM78uwDc0 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 PLaTkl0xynFS7VMzNz4wTPZLJrt50bHLY4 belongs to a playlist. Check the FAQ of the plugin or send error messages to support.