Error when adding gadget by URL to Google Sites page

[NetScr1be]

Adding this URL;

http://sharedspaces.googlelabs.com/huAiXmiyq2

via the instructions here;

http://sharedspaces.googlelabs.com/p/embedgadget?url=http://sharedspaces.googlelabs.com/huAiXmiyq2

gave me the following error;

The gadget you added is not valid

Unsupported feature: org.apache.shindig.common.xml.XmlException: The
markup in the document preceding the root element must be well-formed.
At: (1,3)

Please advise if this is not the correct place to report this.

[NetScr1be]

I was however to get it working via the embed API (http://
sharedspaces.googlelabs.com/p/api/embed)

You can see it here: https://sites.google.com/site/netscr1begadgetcollection/

On Aug 3, 8:44 pm, NetScr1be <pbo...@gmail.com> wrote:
> Adding this URL;
>
> http://sharedspaces.googlelabs.com/huAiXmiyq2
>
> via the instructions here;
>

> http://sharedspaces.googlelabs.com/p/embedgadget?url=http://sharedspa...