어플에서 twitter로 글을 올리는 어플을 제작중입니다.

@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        final EditText input_id = (EditText)findViewById(R.id.user_id);
        final EditText input_pw = (EditText)findViewById(R.id.password);
        final EditText input_text = (EditText)findViewById(R.id.input_text);

        Button signin = (Button)findViewById(R.id.sign_in_button);
        signin.setOnClickListener(new View.OnClickListener() {
         public void onClick(View v){
          username = (String)input_id.getText().toString();
          password = (String)input_pw.getText().toString();
          update_text = (String)input_text.getText().toString();

          if( username.equals("") || password.equals("") || update_text.equals(""))
          {
           Toast.makeText(getApplicationContext(), "wrong input", Toast.LENGTH_SHORT)
            .show();
          }
          else
          {
                 Twitter twitter = new Twitter(username, password);
                 Status status;
     try {
      status = twitter.updateStatus(update_text);
      Toast.makeText(getApplicationContext(), "Successfully updated the status to [" + status.getText() + "].", Toast.LENGTH_LONG)
         .show();
     } catch (TwitterException e) {
      // TODO Auto-generated catch block
            Toast.makeText(getApplicationContext(), "Fail to update text [" + e + "].", Toast.LENGTH_LONG)
         .show();
     }
          }
         }
        });

    }

위의 소스를 보시면 twitter객체를 생성하여 updateStatus()를 이용하여 글을 올리려고 합니다.
소스를 돌려본 결과 LogCat에 다음과 같은 익셉션이 일어납니다.
12-28 17:59:15.684: INFO/11(8567): 401:Authentication credentials were missing or incorrect.
12-28 17:59:15.684: INFO/11(8567): TwitterException{exceptionCode=[15bb6564-00f9bf33], statusCode=401, retryAfter=0, rateLimitStatus=null, version=2.1.9-SNAPSHOT(build: 2dd26b04a45a3eb2de7e35de087e90aeeb2f01fb)}


고수님들 알려주세요 ㅜ

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