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Error type: "Forbidden". Error message: "Method doesn't allow unregistered callers (callers without established identity). Please use API Key or other form of API consumer identity to call this API." Domain: "global". Reason: "forbidden".

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

Check in YouTube if the id UCvPr522-hqXe-k74OHXM9vQ belongs to a . Check the FAQ of the plugin or send error messages to support.