Error type: "Forbidden". Error message: "The request cannot be completed because you have exceeded your quota." Domain: "youtube.quota". Reason: "quotaExceeded".
Did you added your own Google API key? Look at the help.
Check in YouTube if the id PLuBgWmyyMxc9bnI0ouT9wyiKnLaWTL4bs belongs to a playlist. Check the FAQ of the plugin or send error messages to support.