DotNetOpenAuth: No OpenID endpoint found

I've read the following manual: http://code.google.com/googleapps/marketplace/tutorial_dotnet.html

Am I correct that nothing special is required to be done to use google API for user SSO?

But when I tried to launch "Hello World" for marketplace application it returned me an error: Blockquote

Blockquote> No OpenID endpoint found. Blockquote

When

IAuthenticationRequest request = relyingParty.CreateRequest(openIdBox.Text); 

was called. The v开发者_开发技巧alue of "openIdBox.Text" is my google email.

P.S. My investigation of stackoverflow topics linked to the same error gives nothing.

Please advise!

Any thoughts are welcome!

You can't use your Google email as your OpenID. Instead, when using Google, you typically use http://www.google.com/accounts/o8/id as your OpenID; Google will then guide you to ask for your email address. The relying party may not be able to find out what your email address is (depending on whether you approve releasing this data).