Apps Issue while access contacts of android

[rishabh]

Hi to all,
I am new for android development. I am trying read and write contacts to android addressbook.
I tried following line of code for write name into android

public class SecondApp extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

ContentValues values = new ContentValues();
values.put(Contacts.People.NAME, "Rishabh");
ContentResolver cr = getContentResolver();
Uri uri = cr.insert(People.CONTENT_URI, values);

but i am getting "The application has stopped unexpectedly. Please try again" message.

what is wrong in it ?
How can i access contacts of android ?

Thanks in advance...