Я пытаюсь создать график в Android с помощью библиотеки Achartengine. После запуска эмулятора его просто показывает"sorry your app unexpectedly closed.try again.force close"

Я сомневаюсь только в файле Manifest.xml, подходит ли мой файл манифеста? Если нет, пожалуйста, дайте мне понять.

Please find my sources,manifest.xml and logcat for reference

LOGCAT

08-22 11:47:05.763: D/AndroidRuntime(537): Shutting down VM
08-22 11:47:05.775: W/dalvikvm(537): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
08-22 11:47:05.783: E/AndroidRuntime(537): FATAL EXCEPTION: main
08-22 11:47:05.783: E/AndroidRuntime(537): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.graphs_test/com.example.graphs_test.MainActivity}: android.content.ActivityNotFoundException: Unable to find explicit activity class {com.example.graphs_test/org.achartengine.GraphicalActivity}; have you declared this activity in your AndroidManifest.xml?
08-22 11:47:05.783: E/AndroidRuntime(537):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
08-22 11:47:05.783: E/AndroidRuntime(537):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
08-22 11:47:05.783: E/AndroidRuntime(537):  at android.app.ActivityThread.access$2300(ActivityThread.java:125)
08-22 11:47:05.783: E/AndroidRuntime(537):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
08-22 11:47:05.783: E/AndroidRuntime(537):  at android.os.Handler.dispatchMessage(Handler.java:99)
08-22 11:47:05.783: E/AndroidRuntime(537):  at android.os.Looper.loop(Looper.java:123)
08-22 11:47:05.783: E/AndroidRuntime(537):  at android.app.ActivityThread.main(ActivityThread.java:4627)
08-22 11:47:05.783: E/AndroidRuntime(537):  at java.lang.reflect.Method.invokeNative(Native Method)
08-22 11:47:05.783: E/AndroidRuntime(537):  at java.lang.reflect.Method.invoke(Method.java:521)
08-22 11:47:05.783: E/AndroidRuntime(537):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
08-22 11:47:05.783: E/AndroidRuntime(537):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
08-22 11:47:05.783: E/AndroidRuntime(537):  at dalvik.system.NativeStart.main(Native Method)
08-22 11:47:05.783: E/AndroidRuntime(537): Caused by: android.content.ActivityNotFoundException: Unable to find explicit activity class {com.example.graphs_test/org.achartengine.GraphicalActivity}; have you declared this activity in your AndroidManifest.xml?
08-22 11:47:05.783: E/AndroidRuntime(537):  at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1404)
08-22 11:47:05.783: E/AndroidRuntime(537):  at android.app.Instrumentation.execStartActivity(Instrumentation.java:1378)
08-22 11:47:05.783: E/AndroidRuntime(537):  at android.app.Activity.startActivityForResult(Activity.java:2817)
08-22 11:47:05.783: E/AndroidRuntime(537):  at android.app.Activity.startActivity(Activity.java:2923)
08-22 11:47:05.783: E/AndroidRuntime(537):  at com.example.graphs_test.MainActivity.onCreate(MainActivity.java:21)
08-22 11:47:05.783: E/AndroidRuntime(537):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
08-22 11:47:05.783: E/AndroidRuntime(537):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
08-22 11:47:05.783: E/AndroidRuntime(537):  ... 11 more

Manifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.graphs_test"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
    android:minSdkVersion="8"
    android:targetSdkVersion="15" />

<application
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name=".MainActivity"
        android:label="@string/title_activity_main" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>
</manifest>

MainActivity.java

public class MainActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Intent intent = buildIntent();
    startActivity(intent);         
}

public Intent buildIntent() {
     int[] values = new int[] { 5, 15, 25, 50, 75 };       
     String[] bars = new String[] {"Francesca's",  "King of Clubs", 
                                "Zen Lounge", "Tied House", "Molly Magees"};
     int[] colors = new int[] { Color.BLUE, Color.GREEN, Color.MAGENTA, 
                                  Color.YELLOW, Color.CYAN };

     CategorySeries series = new CategorySeries("Pie Chart");  
     DefaultRenderer dr = new DefaultRenderer();  

     for (int v=0; v<5; v++){    
         series.add(bars[v], values[v]);
         SimpleSeriesRenderer r = new SimpleSeriesRenderer();
         r.setColor(colors[v]);
         dr.addSeriesRenderer(r);
     }
     dr.setZoomButtonsVisible(true);
     dr.setZoomEnabled(true);
     dr.setChartTitleTextSize(20);
     return ChartFactory.getPieChartIntent(    
                             this, series, dr, "Pie of bars");
   }

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.activity_main, menu);
    return true;
}
}

Спасибо за ваше драгоценное время! ..