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Error type: "Forbidden". Error message: "The referrer does not match the referrer restrictions configured on your API key. Please use the API Console to update your key restrictions." Domain: "usageLimits". Reason: "ipRefererBlocked".

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

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