Error type: "Forbidden". Error message: "Access Not Configured. YouTube Data API has not been used in project 825900879 before or it is disabled. Enable it by visiting then retry. If you enabled this API recently, wait a few minutes for the action to propagate to our systems and retry." Domain: "usageLimits". Reason: "accessNotConfigured".

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

Check in YouTube if the id PLItjLOq2rnCQWAVUwf1fsf45tar1y-shj belongs to a playlist. Check the FAQ of the plugin or send error messages to support.