Error type: "Not Found". Error message: "The playlist identified with the requests
parameter cannot be found." Domain: "youtube.playlistItem". Reason: "playlistNotFound". Location type: "parameter". Location: "playlistId".
Did you added your own Google API key? Look at the help
Check in YouTube if the id PL3J9SOdeSBnVUX38JmCyp-KMtWNaGyZDM
belongs to a playlist. Check the FAQ
of the plugin or send error messages to support