ArticleListActivity error

Hello,
after i solved the previous error, it was a bad for me i just had to add appcompt..

now i'm able to run the application, but i get the following error and the application shuts down, here what it gave me:

04-12 14:47:23.509: E/AndroidRuntime(1049): FATAL EXCEPTION: main 04-12 14:47:23.509: E/AndroidRuntime(1049): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.nerdability.android/com.nerdability.android.ArticleListActivity}: java.lang.ClassNotFoundException: com.nerdability.android.ArticleListActivity 04-12 14:47:23.509: E/AndroidRuntime(1049): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1880) 04-12 14:47:23.509: E/AndroidRuntime(1049): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981) 04-12 14:47:23.509: E/AndroidRuntime(1049): at android.app.ActivityThread.access$600(ActivityThread.java:123) 04-12 14:47:23.509: E/AndroidRuntime(1049): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147) 04-12 14:47:23.509: E/AndroidRuntime(1049): at android.os.Handler.dispatchMessage(Handler.java:99) 04-12 14:47:23.509: E/AndroidRuntime(1049): at android.os.Looper.loop(Looper.java:137) 04-12 14:47:23.509: E/AndroidRuntime(1049): at android.app.ActivityThread.main(ActivityThread.java:4424) 04-12 14:47:23.509: E/AndroidRuntime(1049): at java.lang.reflect.Method.invokeNative(Native Method) 04-12 14:47:23.509: E/AndroidRuntime(1049): at java.lang.reflect.Method.invoke(Method.java:511) 04-12 14:47:23.509: E/AndroidRuntime(1049): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 04-12 14:47:23.509: E/AndroidRuntime(1049): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 04-12 14:47:23.509: E/AndroidRuntime(1049): at dalvik.system.NativeStart.main(Native Method) 04-12 14:47:23.509: E/AndroidRuntime(1049): Caused by: java.lang.ClassNotFoundException: com.nerdability.android.ArticleListActivity 04-12 14:47:23.509: E/AndroidRuntime(1049): at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61) 04-12 14:47:23.509: E/AndroidRuntime(1049): at java.lang.ClassLoader.loadClass(ClassLoader.java:501) 04-12 14:47:23.509: E/AndroidRuntime(1049): at java.lang.ClassLoader.loadClass(ClassLoader.java:461) 04-12 14:47:23.509: E/AndroidRuntime(1049): at android.app.Instrumentation.newActivity(Instrumentation.java:1023) 04-12 14:47:23.509: E/AndroidRuntime(1049): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1871) 04-12 14:47:23.509: E/AndroidRuntime(1049): ... 11 more 04-12 14:47:23.661: I/dalvikvm(1049): threadid=3: reacting to signal 3 04-12 14:47:23.674: I/dalvikvm(1049): Wrote stack traces to '/data/anr/traces.txt' 04-12 14:47:24.061: I/dalvikvm(1049): threadid=3: reacting to signal 3 04-12 14:47:24.073: I/dalvikvm(1049): Wrote stack traces to '/data/anr/traces.txt'

it gives me error in RssService, but i don't know whats the problem in it! i done nothing to the source code except adding the appcompt-v4 jar file!!
can you please help me?

[redapple1900]

ARE you using the the package or another one ?