Android uygulama hatası ?

Merhaba,

Android api 16 (4.1.2) ile bir uygulama yazdım.Uygulama minimum sdk api 7 olarak ayarladım.4.0 altı için ugulama açılmıyor.Nasıl düzeltebilirim.

03-31 14:13:18.651: E/AndroidRuntime(310): Uncaught handler: thread main exiting due to uncaught exception
03-31 14:13:18.731: E/AndroidRuntime(310): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.mucahidkincir.dgs/com.mucahidkincir.dgs.MainActivity}: java.lang.ClassNotFoundException: com.mucahidkincir.dgs.MainActivity in loader dalvik.system.PathClassLoader@45f3f8f8
03-31 14:13:18.731: E/AndroidRuntime(310):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2417)
03-31 14:13:18.731: E/AndroidRuntime(310):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2512)
03-31 14:13:18.731: E/AndroidRuntime(310):     at android.app.ActivityThread.access$2200(ActivityThread.java:119)
03-31 14:13:18.731: E/AndroidRuntime(310):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863)
03-31 14:13:18.731: E/AndroidRuntime(310):     at android.os.Handler.dispatchMessage(Handler.java:99)
03-31 14:13:18.731: E/AndroidRuntime(310):     at android.os.Looper.loop(Looper.java:123)
03-31 14:13:18.731: E/AndroidRuntime(310):     at android.app.ActivityThread.main(ActivityThread.java:4363)
03-31 14:13:18.731: E/AndroidRuntime(310):     at java.lang.reflect.Method.invokeNative(Native Method)
03-31 14:13:18.731: E/AndroidRuntime(310):     at java.lang.reflect.Method.invoke(Method.java:521)
03-31 14:13:18.731: E/AndroidRuntime(310):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
03-31 14:13:18.731: E/AndroidRuntime(310):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
03-31 14:13:18.731: E/AndroidRuntime(310):     at dalvik.system.NativeStart.main(Native Method)
03-31 14:13:18.731: E/AndroidRuntime(310): Caused by: java.lang.ClassNotFoundException: com.mucahidkincir.dgs.MainActivity in loader dalvik.system.PathClassLoader@45f3f8f8
03-31 14:13:18.731: E/AndroidRuntime(310):     at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:243)
03-31 14:13:18.731: E/AndroidRuntime(310):     at java.lang.ClassLoader.loadClass(ClassLoader.java:573)
03-31 14:13:18.731: E/AndroidRuntime(310):     at java.lang.ClassLoader.loadClass(ClassLoader.java:532)
03-31 14:13:18.731: E/AndroidRuntime(310):     at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
03-31 14:13:18.731: E/AndroidRuntime(310):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2409)
03-31 14:13:18.731: E/AndroidRuntime(310):     ... 11 more