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
PLJzCYf5ZrNd1dmO42zvT1PWmdoEugVF97 belongs to a playlist. Check the
FAQ of the plugin or send error messages to
support.
