You Tube Feed missing informations

Hello,
I just wish to suggest to include in the Wiki page dedicated to the content type mentioned in object ( www.xerte.org.uk/wiki/doku.php?id=media_youtube_feed_page ) some information about how to fix the error message that is returned when the page si visualised:

The Youtube API returned the following error: '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.'
If no API key is set, ask your admin to set up a key in api_keys.php (see api_keys.dist.php for a template).

Probably the configuration of the page or the project or the whole Xerte installation is missing some bit to make this type of content work properly?

Thank you!

Fabrizio