the authorization problem by using oauth

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ASP.NET

Google

web_development

Dear all

First, my intention is to use google's account to log into my test website(developed by ASP .NET4.0). I went to this site(http://easyoauth.codeplex.com/[^]) to download the libraries. But when I starting test, I get this error message:

Exception: OAuthUnauthorizedException
Message: ERROR_OAUTH_UNAUTHORIZED
Signature: 8dnG2LhBIpyoqld80BojQXE5N10=
Base String: GET&https%3A%2F%2Fwww.google.com%2Faccounts%2FOAuthGetRequestToken&oauth_callback%3Dhttp%253A%252F%252F%255Byour_url%255D%252FOAuthVerifyHandler.do%26oauth_consumer_key%3D%2A%3A00721506596312397360%26oauth_nonce%3D50c76fe98ae4906023fa18e85a5afb5f%26oauth_signature_method%3DHMAC-SHA1%26oauth_timestamp%3D1313043984%26oauth_version%3D1.0%26scope%3Dhttps%253A%252F%252Fwww.google.com%252Fbase%252Ffeeds%252F%2520http%253A%252F%252Fgdata.youtube.com%252Ffeeds%252Fapi%252Fvideos%252F
Header: OAuth oauth_callback="http%3A%2F%2F%5Byour_url%5D%2FOAuthVerifyHandler.do",oauth_consumer_key="*:00721506596312397360",oauth_nonce="50c76fe98ae4906023fa18e85a5afb5f",oauth_signature="8dnG2LhBIpyoqld80BojQXE5N10%3D",oauth_signature_method="HMAC-SHA1",oauth_timestamp="1313043984",oauth_version="1.0"
Responsen Data: Consumer is not registered: *:00721506596312397360

I noticed the last line of this message but pretty confused. It will be great if anyone who has ever encountered this problem and give me some suggestions. Thank you very much.