Error type: "Forbidden". Error message: "Requests from referer https://www.googleapis.com/youtube/v3/playlistItems?part=snippet,status&playlistId=PLLIQ_9K8NJsIvCmwWhWwTVXb3NLGfEJHO&maxResults=4&key=AIzaSyBikhsydQ1o1NFZDRiSxajyXjfY_oBhYsg are blocked." Domain: "global". Reason: "forbidden".

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

Check in YouTube if the id PLLIQ_9K8NJsIvCmwWhWwTVXb3NLGfEJHO belongs to a playlist. Check the FAQ of the plugin or send error messages to support.