Error type: "Forbidden". Error message: "Project 314782821622 has been scheduled for deletion and cannot be used for API calls. Visit to undelete the project." Domain: "usageLimits". Reason: "accessNotConfigured".

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

Check in YouTube if the id PLScC8g4bqD47c-qHlsfhGH3j6Bg7jzFy- belongs to a playlist. Check the FAQ of the plugin or send error messages to support.