A Settembre 2013 on line

Error type: "Forbidden". Error message: "Access Not Configured. YouTube Data API has not been used in project 537752813138 before or it is disabled. Enable it by visiting https://console.developers.google.com/apis/api/youtube.googleapis.com/overview?project=537752813138 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". Location type: "". Location: "".

Check in YouTube if the id maxvilno belongs to a username. Check the FAQ of the plugin or send error messages to support.