asp.net mvc3, LinqToTwitter

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ASP.NET

API

twitter

I tried with this code to post on the wall (Twitter) of a user

if (credentials.ConsumerKey == null || credentials.ConsumerSecret == null)
{
   credentials.ConsumerKey = ConfigurationManager.AppSettings["twitterConsumerKey"];
   credentials.ConsumerSecret = ConfigurationManager.AppSettings["twitterConsumerSecret"];
}

auth = new MvcAuthorizer
{
   Credentials = credentials
};

auth.CompleteAuthorization(Request.Url);

if (!auth.IsAuthorized)
{
   Uri specialUri = new Uri(Request.Url.ToString());
   return auth.BeginAuthorization(specialUri);
}

twitterCtx = new TwitterContext(auth);
                    
twitterCtx.UpdateStatus("Welcome");         

Problem: the first test goes well, I posted on the wall the second test shows this error:

Error while querying Twitter.

someone can help me to solve this problem

Thanks.