Android :: Why Does My Application Keep Getting Error And Then Quits?

I followed the developer guides on the Android website. It is working fine for a Hello World application but when I try and transition between Activities, my application keeps giving an "The application () has stopped unexpectedly. Please try again later." error and the application then quits. This happens when I click the button in the Subscribe Activity.

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

Button subButton = (Button)findViewById(R.id.subscribe);
subButton.setOnClickListener(this);}

public void onClick(View v) {
Intent subIntent = new Intent(Subscribe.this,Subscribed.class);
startActivity(subIntent);}}

Subscribed.java
public class Subscribed extends Activity {/** Called when the activity is first created. */ @Override
public void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);
setContentView(R.layout.subscribed);}}
Logcat Log File