logcat
08-30 03:26:36.205: D/dalvikvm(461): GC_EXTERNAL_ALLOC freed 43K, 53% free 2554K/5379K, external 1625K/2137K, paused 109ms
08-30 03:26:36.625: D/dalvikvm(461): GC_EXTERNAL_ALLOC freed 1K, 53% free 2556K/5379K, external 2713K/2732K, paused 113ms
08-30 03:26:36.755: D/AndroidRuntime(461): Shutting down VM
08-30 03:26:36.755: W/dalvikvm(461): threadid=1: thread exiting with uncaught exception (group=0x40015560)
08-30 03:26:36.795: E/AndroidRuntime(461): FATAL EXCEPTION: main
08-30 03:26:36.795: E/AndroidRuntime(461): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.servecommunty/com.example.servecommunty.MainActivity}: java.lang.ClassCastException: android.widget.ImageButton
08-30 03:26:36.795: E/AndroidRuntime(461): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
08-30 03:26:36.795: E/AndroidRuntime(461): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
08-30 03:26:36.795: E/AndroidRuntime(461): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
08-30 03:26:36.795: E/AndroidRuntime(461): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
08-30 03:26:36.795: E/AndroidRuntime(461): at android.os.Handler.dispatchMessage(Handler.java:99)
08-30 03:26:36.795: E/AndroidRuntime(461): at android.os.Looper.loop(Looper.java:123)
08-30 03:26:36.795: E/AndroidRuntime(461): at android.app.ActivityThread.main(ActivityThread.java:3683)
08-30 03:26:36.795: E/AndroidRuntime(461): at java.lang.reflect.Method.invokeNative(Native Method)
08-30 03:26:36.795: E/AndroidRuntime(461): at java.lang.reflect.Method.invoke(Method.java:507)
08-30 03:26:36.795: E/AndroidRuntime(461): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
08-30 03:26:36.795: E/AndroidRuntime(461): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
08-30 03:26:36.795: E/AndroidRuntime(461): at dalvik.system.NativeStart.main(Native Method)
08-30 03:26:36.795: E/AndroidRuntime(461): Caused by: java.lang.ClassCastException: android.widget.ImageButton
08-30 03:26:36.795: E/AndroidRuntime(461): at com.example.servecommunty.MainActivity.onCreate(MainActivity.java:20)
08-30 03:26:36.795: E/AndroidRuntime(461): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
08-30 03:26:36.795: E/AndroidRuntime(461): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
08-30 03:26:36.795: E/AndroidRuntime(461): ... 11 more

androidmanifest에 액티비티 추가하고 src에도 똑같이 추가 했습니다.
그런데 계속 에러가 나네요
ㅜㅜ 어떡게 해야될까요?
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