Error type: "Forbidden". Error message: "The referrer https://www.googleapis.com/youtube/v3/playlistItems?part=snippet,status&playlistId=FLA25hreirdP2l9t7Nv_KjIw&maxResults=50&key=AIzaSyDbx_iqGGS68WZTe88Q68uxZFOW8JDHzaE 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 FLA25hreirdP2l9t7Nv_KjIw belongs to a playlist. Check the FAQ of the plugin or send error messages to support.