twitter4j를 이용하여 간단한 클라이언트만드려고하는데요
오류는없는데 실행하면 이런에러가뜨네요
어떤문제인지 당췌 알수가없네여 ㅠㅠ

//TwitterClient.java
package my.TwitterClient;
import twitter4j.Status;
import twitter4j.Twitter;
import twitter4j.TwitterException;
import twitter4j.TwitterFactory;
import twitter4j.http.AccessToken;
import twitter4j.http.RequestToken;
import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
public class TwitterClient extends Activity {
    private static final String TAG = null;
 /** Called when the activity is first created. */
 public static String consumerKey = "";
 public static String consumerSecret = "";
 public static Uri CALLBACK_URL = Uri.parse("lkc9999://twitter");
 
 private Twitter twitter; 
 private AccessToken acToken; 
 private RequestToken rqToken; 
 private Status status = null; 
 
 @Override
 public void onCreate(Bundle savedInstanceState){
  twitter = new TwitterFactory().getInstance();
  twitter.setOAuthConsumer(consumerKey, consumerSecret);
  try{
   rqToken = twitter.getOAuthRequestToken(CALLBACK_URL.toString());
  }catch(TwitterException e){
   Log.e(TAG, e.getMessage());
  }
  startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(rqToken.getAuthorizationURL())));
 }
 
 protected void onNewIntent(Intent intent){
  super.onNewIntent(intent);
  Uri uri = intent.getData();
  if(uri != null && CALLBACK_URL.getScheme().equals(uri.getScheme())){
   String oauth_verifier = uri.getQueryParameter("oauth_verifier");
   try{
    acToken = twitter.getOAuthAccessToken(rqToken, oauth_verifier);
    status = twitter.updateStatus("Test!!!");
   }catch(TwitterException e){
    Log.e(TAG, e.getMessage());
   }
  }
 }
}