매니페스트등록 햇구요 ㅠㅠ

package android.androidspace;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;

public class AndroidFirstMenuActivity extends Activity implements
  OnClickListener {
 /** Called when the activity is first created. */
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.menu);
  findViewById(R.id.start).setOnClickListener(this);
  findViewById(R.id.wordadd).setOnClickListener(this);
 }

 @Override
 public void onClick(View v) {
  // TODO Auto-generated method stub
  switch (v.getId()) {
  case R.id.start:
   Intent intent = new Intent(AndroidFirstMenuActivity.this,
     AndroidFirstActivity.class);
   startActivity(intent);
   break;
  }
  switch (v.getId()) {
  case R.id.wordadd:
   Intent intent = new Intent(AndroidFirstMenuActivity.this,
     AndroidFirstWordAddActivity.class);
   startActivity(intent);
   break;
  }

 }
}

왜안될까요 ㅠㅠ