I'm trying to run the native-activity example that comes with the NDK, and 
I got this error:

E/AndroidRuntime(10708): FATAL EXCEPTION: main
E/AndroidRuntime(10708): java.lang.RuntimeException: Unable to instantiate 
activity 
ComponentInfo{com.example.native_activity/android.app.NativeActivity}: 
java.lang.ClassNotFoundException: android.app.NativeActivity in loader 
dalvik.system.PathClassLoader[.]
E/AndroidRuntime(10708): at 
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2585)
E/AndroidRuntime(10708): at 
android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
E/AndroidRuntime(10708): at 
android.app.ActivityThread.access$2300(ActivityThread.java:125)
E/AndroidRuntime(10708): at 
android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
E/AndroidRuntime(10708): at 
android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime(10708): at android.os.Looper.loop(Looper.java:123)
E/AndroidRuntime(10708): at 
android.app.ActivityThread.main(ActivityThread.java:4627)
E/AndroidRuntime(10708): at java.lang.reflect.Method.invokeNative(Native 
Method)
E/AndroidRuntime(10708): at java.lang.reflect.Method.invoke(Method.java:521)
E/AndroidRuntime(10708): at 
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
E/AndroidRuntime(10708): at 
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
E/AndroidRuntime(10708): at dalvik.system.NativeStart.main(Native Method)
E/AndroidRuntime(10708): Caused by: java.lang.ClassNotFoundException: 
android.app.NativeActivity in loader dalvik.system.PathClassLoader[.]
E/AndroidRuntime(10708): at 
dalvik.system.PathClassLoader.findClass(PathClassLoader.java:243)
E/AndroidRuntime(10708): at 
java.lang.ClassLoader.loadClass(ClassLoader.java:573)
E/AndroidRuntime(10708): at 
java.lang.ClassLoader.loadClass(ClassLoader.java:532)
E/AndroidRuntime(10708): at 
android.app.Instrumentation.newActivity(Instrumentation.java:1021)
E/AndroidRuntime(10708): at 
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2577)
E/AndroidRuntime(10708): ... 11 more
W/ActivityManager( 1330):   Force finishing activity 
com.example.native_activity/android.app.NativeActivity

Does anyone know what causes this?

Thanks.

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