Error type: "Forbidden". Error message: "Project 782791127097 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 PLaTkl0xynFS7VMzNz4wTPZLJrt50bHLY4 belongs to a playlist. Check the FAQ of the plugin or send error messages to support.