Android Activity Exception

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Java

Mobile

Android

Hi, I'm trying to start a new activity when the Button playlistBtn is clicked, and I'm getting a NullPointerException, but I can't see where did I go wrong with my references.
Please help.

This is the error message:
java.lang.RuntimeException: Unable to start activity ComponentInfo{app.and.androidmusic/app.and.androidmusic.PlaylistActivity}: java.lang.NullPointerException

MainActivity.java:

public class MainActivity extends ListActivity {
...
protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
...
Button btnPlaylist = (Button) findViewById(R.id.playlistBtn);
btnPlaylist.setOnClickListener(new View.OnClickListener() {					
                     @Override
	   		public void onClick(View arg0) {
			Intent in = new Intent(getApplicationContext(), PlaylistActivity.class);
						startActivity(in);

PlaylistActivity:

public class PlaylistActivity extends ListActivity{
...
@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_playlist); {

AndroidManifest.xml:

<activity
            android:name="app.and.androidmusic.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>        
        <activity
            android:name=".PlaylistActivity" />