실행하면 unfortunatly aram has stopped 이렇게 에러가 나는데 어떻게 해야하나요

09-22 02:09:33.082: D/AndroidRuntime(667): Shutting down VM
09-22 02:09:33.103: W/dalvikvm(667): threadid=1: thread exiting with uncaught exception (group=0x409c01f8)
09-22 02:09:33.122: E/AndroidRuntime(667): FATAL EXCEPTION: main
09-22 02:09:33.122: E/AndroidRuntime(667): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.aram/com.example.aram.MainActivity}: java.lang.ClassNotFoundException: com.example.aram.MainActivity
09-22 02:09:33.122: E/AndroidRuntime(667):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1880)
09-22 02:09:33.122: E/AndroidRuntime(667):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
09-22 02:09:33.122: E/AndroidRuntime(667):  at android.app.ActivityThread.access$600(ActivityThread.java:123)
09-22 02:09:33.122: E/AndroidRuntime(667):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
09-22 02:09:33.122: E/AndroidRuntime(667):  at android.os.Handler.dispatchMessage(Handler.java:99)
09-22 02:09:33.122: E/AndroidRuntime(667):  at android.os.Looper.loop(Looper.java:137)
09-22 02:09:33.122: E/AndroidRuntime(667):  at android.app.ActivityThread.main(ActivityThread.java:4424)
09-22 02:09:33.122: E/AndroidRuntime(667):  at java.lang.reflect.Method.invokeNative(Native Method)
09-22 02:09:33.122: E/AndroidRuntime(667):  at java.lang.reflect.Method.invoke(Method.java:511)
09-22 02:09:33.122: E/AndroidRuntime(667):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
09-22 02:09:33.122: E/AndroidRuntime(667):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
09-22 02:09:33.122: E/AndroidRuntime(667):  at dalvik.system.NativeStart.main(Native Method)
09-22 02:09:33.122: E/AndroidRuntime(667): Caused by: java.lang.ClassNotFoundException: com.example.aram.MainActivity
09-22 02:09:33.122: E/AndroidRuntime(667):  at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)
09-22 02:09:33.122: E/AndroidRuntime(667):  at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
09-22 02:09:33.122: E/AndroidRuntime(667):  at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
09-22 02:09:33.122: E/AndroidRuntime(667):  at android.app.Instrumentation.newActivity(Instrumentation.java:1023)
09-22 02:09:33.122: E/AndroidRuntime(667):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1871)
09-22 02:09:33.122: E/AndroidRuntime(667):  ... 11 more