Twitter Error: Communication with the service provider failed: api.twitter.com

I am creating a twitter sharing by using sugree's twitter-android-sdk. So when the activity starts i am calling..

Twitter tweet = new Twitter(R.drawable.ico开发者_StackOverflow社区n);
     tweet.authorize(this, null, "XXXXXXXXXXXXXX", "XXXXXXXXXXXXXX", new TwitRequestListener());

I was working fine befor. But suddenly i started getting this error:

04-25 12:03:28.346: DEBUG/twitter(458): Login failed: com.sugree.twitter.DialogError: Communication

with the service provider failed: api.twitter.com

Thanks in advance,

Aby

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Problem was with the twitter server. It started working from next day.