Unfortunately the "app name" stopped! My first Android app

I've just started to build my first android app and this 1st time errors are bugging me now since 2 days. Finding no solution I had to come here. I have been following Androids official tutorial for my first app and can't open my app.

Error: "Unfortunately "app name" has stopped"

Here is my manisfest file,
I've just started to build my first android app and this 1st time errors are bugging me now since 2 days. Finding no solution I had to come here. I have been following Androids official tutorial for my first app and can't open my app.

Error: "Unfortunately "app name" has stopped"

Here is my manisfest file,



Error Logs :
03-10 08:59:54.310: D/dalvikvm(1671): Not late-enabling CheckJNI (already on)
03-10 08:59:54.400: D/AndroidRuntime(1671): Shutting down VM
03-10 08:59:54.400: W/dalvikvm(1671): threadid=1: thread exiting with uncaught exception (group=0xb2d88b20)
03-10 08:59:54.400: E/AndroidRuntime(1671): FATAL EXCEPTION: main
03-10 08:59:54.400: E/AndroidRuntime(1671): Process: app2.android, PID: 1671
03-10 08:59:54.400: E/AndroidRuntime(1671): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{app2.android/app2.android.MainActivity}: java.lang.ClassNotFoundException: Didn't find class "app2.android.MainActivity" on path: DexPathList[[zip file "/data/app/app2.android-1.apk"],nativeLibraryDirectories=[/data/app-lib/app2.android-1, /vendor/lib, /system/lib]]
03-10 08:59:54.400: E/AndroidRuntime(1671): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2121)
03-10 08:59:54.400: E/AndroidRuntime(1671): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
03-10 08:59:54.400: E/AndroidRuntime(1671): at android.app.ActivityThread.access$800(ActivityThread.java:135)
03-10 08:59:54.400: E/AndroidRuntime(1671): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
03-10 08:59:54.400: E/AndroidRuntime(1671): at android.os.Handler.dispatchMessage(Handler.java:102)
03-10 08:59:54.400: E/AndroidRuntime(1671): at android.os.Looper.loop(Looper.java:136)
03-10 08:59:54.400: E/AndroidRuntime(1671): at android.app.ActivityThread.main(ActivityThread.java:5017)
03-10 08:59:54.400: E/AndroidRuntime(1671): at java.lang.reflect.Method.invokeNative(Native Method)
03-10 08:59:54.400: E/AndroidRuntime(1671): at java.lang.reflect.Method.invoke(Method.java:515)
03-10 08:59:54.400: E/AndroidRuntime(1671): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
03-10 08:59:54.400: E/AndroidRuntime(1671): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
03-10 08:59:54.400: E/AndroidRuntime(1671): at dalvik.system.NativeStart.main(Native Method)
03-10 08:59:54.400: E/AndroidRuntime(1671): Caused by: java.lang.ClassNotFoundException: Didn't find class "app2.android.MainActivity" on path: DexPathList[[zip file "/data/app/app2.android-1.apk"],nativeLibraryDirectories=[/data/app-lib/app2.android-1, /vendor/lib, /system/lib]]
03-10 08:59:54.400: E/AndroidRuntime(1671): at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
03-10 08:59:54.400: E/AndroidRuntime(1671): at java.lang.ClassLoader.loadClass(ClassLoader.java:497)
03-10 08:59:54.400: E/AndroidRuntime(1671): at java.lang.ClassLoader.loadClass(ClassLoader.java:457)
03-10 08:59:54.400: E/AndroidRuntime(1671): at android.app.Instrumentation.newActivity(Instrumentation.java:1061)
03-10 08:59:54.400: E/AndroidRuntime(1671): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2112)
03-10 08:59:54.400: E/AndroidRuntime(1671): ... 11 more

I have been rolling all over the internet for solutions, tried so many, doesn't work!!! PLEASE HELP!