Error on Twitter API Integration authorization issue

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C#

ASP.NET4

Hi,
I am using Twitter API, For the purpose of integrate twitter features from my application. I am using Twitterizer2.dll. But the problem is, Not only the Authentication & authorization, all the twitter function returns "page System.Xml.XmlException: Data at the root level is invalid. Line 1".

It is working fine on another system even if copy the same code.

That same code worked fine in past days, but today that returns XML Exception. please any one help me.

I cant find what held. Please let me know how to fix this issue.

code for Authorization Url function :

Example twitter function:

public string GetTwitterAuthorizationUrl(string strConsumerKey, string strConsumerSecret)
{
OAuthTokenResponse reqToken = OAuthUtility.GetRequestToken(strConsumerKey, strConsumerSecret);
return "https://twitter.com/oauth/authorize?oauth_token=" + reqToken.Token;
}