ActionBarActivity catch ein Fehler auf dem Handy

**
Ich wurde empfohlen, um zu verwenden ActionBar-Aktivität**
Hier ist der bisherige code

import android.support.v7.app.ActionBar;
import android.support.v7.app.ActionBarActivity;


public class MainActivity extends Activity  {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main); 

    }

Schrieb ich neue Anwendung und folgte Beratung.

import android.os.Bundle;
    import android.support.v7.app.ActionBar;
    import android.support.v7.app.ActionBarActivity;


    public class MainActivity extends ActionBarActivity {

          @Override
          public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            ActionBar actionBar =getSupportActionBar();
            actionBar.setDisplayHomeAsUpEnabled(true);

            setContentView(R.layout.activity_main);
          }

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

        }

wenn ich ACtionBarActivity statt Aktivität

Ich Fang eine Fehlermeldung auf dem Telefon, wenn ich versuche, um Sie auszuführen.
Bitte sagen Sie mir, was ich falsch gemacht

info von Logcat

    07-27 15:14:19.942: I/Process(21715): Sending signal. PID: 21715 SIG: 9
07-27 15:34:38.521: W/dalvikvm(23579): Unable to resolve superclass of Lcom/example/project/MainActivity; (532)
07-27 15:34:38.521: W/dalvikvm(23579): Link of class 'Lcom/example/project/MainActivity;' failed
07-27 15:34:38.521: D/AndroidRuntime(23579): Shutting down VM
07-27 15:34:38.521: W/dalvikvm(23579): threadid=1: thread exiting with uncaught exception (group=0x40ae5210)
07-27 15:34:38.521: E/AndroidRuntime(23579): FATAL EXCEPTION: main
07-27 15:34:38.521: E/AndroidRuntime(23579): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.project/com.example.project.MainActivity}: java.lang.ClassNotFoundException: com.example.project.MainActivity
07-27 15:34:38.521: E/AndroidRuntime(23579):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1891)
07-27 15:34:38.521: E/AndroidRuntime(23579):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1992)
07-27 15:34:38.521: E/AndroidRuntime(23579):    at android.app.ActivityThread.access$600(ActivityThread.java:127)
07-27 15:34:38.521: E/AndroidRuntime(23579):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1158)
07-27 15:34:38.521: E/AndroidRuntime(23579):    at android.os.Handler.dispatchMessage(Handler.java:99)
07-27 15:34:38.521: E/AndroidRuntime(23579):    at android.os.Looper.loop(Looper.java:137)
07-27 15:34:38.521: E/AndroidRuntime(23579):    at android.app.ActivityThread.main(ActivityThread.java:4441)
07-27 15:34:38.521: E/AndroidRuntime(23579):    at java.lang.reflect.Method.invokeNative(Native Method)
07-27 15:34:38.521: E/AndroidRuntime(23579):    at java.lang.reflect.Method.invoke(Method.java:511)
07-27 15:34:38.521: E/AndroidRuntime(23579):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:823)
07-27 15:34:38.521: E/AndroidRuntime(23579):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:590)
07-27 15:34:38.521: E/AndroidRuntime(23579):    at dalvik.system.NativeStart.main(Native Method)
07-27 15:34:38.521: E/AndroidRuntime(23579): Caused by: java.lang.ClassNotFoundException: com.example.project.MainActivity
07-27 15:34:38.521: E/AndroidRuntime(23579):    at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)
07-27 15:34:38.521: E/AndroidRuntime(23579):    at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
07-27 15:34:38.521: E/AndroidRuntime(23579):    at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
07-27 15:34:38.521: E/AndroidRuntime(23579):    at android.app.Instrumentation.newActivity(Instrumentation.java:1023)
07-27 15:34:38.521: E/AndroidRuntime(23579):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1882)
07-27 15:34:38.521: E/AndroidRuntime(23579):    ... 11 more
07-27 15:34:38.531: I/Process(23579): Sending signal. PID: 23579 SIG: 9

Bearbeiten und exportieren screenshot
http://i.stack.imgur.com/MNfc1.jpg

Abbildung 1-7

http://i.stack.imgur.com/NTpP3.jpg