Error type: "Forbidden". Error message: "Project 387595749928 has been scheduled for deletion and cannot be used for API calls. Visit https://console.developers.google.com/iam-admin/projects?pendingDeletion=true 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 PL6zOCRDX5HUpsx6QZHIT7M1C4MCHOPrAc
belongs to a playlist. Check the FAQ
of the plugin or send error messages to support