Error type: "Not Found". Error message: "The playlist identified with the request's playlistId parameter cannot be found." Domain: "youtube.playlistItem". Reason: "playlistNotFound". Location type: "parameter". Location: "playlistId".

Check in YouTube if the id PLm_E9mvijNjLs7uzyZfL31e3wmI9zD2Vg belongs to a playlist. Check the FAQ of the plugin or send error messages to support.