Application PackageName property override problem. Is this Xamarin bug?

I tried to override Application PackageName Property. But java.lang.UnsatisfiedLinkError (Native method not found) occurred. So I search this problem in google, and I find a question about perfectly same problem(https://forums.xamarin.com/discussion/45434/application-packagename-property-override-problem). But unfortunately there was not an answer. What can I do this problem.

[Application]
public class TestApplication : Application
{
    public override string PackageName
    {
        get
        {
            return "com.fake.packagename";
        }
    }
}

07-17 23:06:57.179 E/AndroidRuntime(25801): FATAL EXCEPTION: main
07-17 23:06:57.179 E/AndroidRuntime(25801): Process: TestApp.TestApp, PID: 25801
07-17 23:06:57.179 E/AndroidRuntime(25801): java.lang.UnsatisfiedLinkError: Native method not found: md5cf27010e14af20e69784a5a54418b85f.TestApplication.n_getPackageName:()Ljava/lang/String;
07-17 23:06:57.179 E/AndroidRuntime(25801): at md5cf27010e14af20e69784a5a54418b85f.TestApplication.n_getPackageName(Native Method)
07-17 23:06:57.179 E/AndroidRuntime(25801): at md5cf27010e14af20e69784a5a54418b85f.TestApplication.getPackageName(TestApplication.java:25)
07-17 23:06:57.179 E/AndroidRuntime(25801): at android.app.ActivityThread.installProvider(ActivityThread.java:4855)
07-17 23:06:57.179 E/AndroidRuntime(25801): at android.app.ActivityThread.installContentProviders(ActivityThread.java:4476)
07-17 23:06:57.179 E/AndroidRuntime(25801): at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4413)
07-17 23:06:57.179 E/AndroidRuntime(25801): at android.app.ActivityThread.access$1500(ActivityThread.java:142)
07-17 23:06:57.179 E/AndroidRuntime(25801): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1263)
07-17 23:06:57.179 E/AndroidRuntime(25801): at android.os.Handler.dispatchMessage(Handler.java:102)
07-17 23:06:57.179 E/AndroidRuntime(25801): at android.os.Looper.loop(Looper.java:136)
07-17 23:06:57.179 E/AndroidRuntime(25801): at android.app.ActivityThread.main(ActivityThread.java:5120)
07-17 23:06:57.179 E/AndroidRuntime(25801): at java.lang.reflect.Method.invokeNative(Native Method)
07-17 23:06:57.179 E/AndroidRuntime(25801): at java.lang.reflect.Method.invoke(Method.java:515)
07-17 23:06:57.179 E/AndroidRuntime(25801): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:792)
07-17 23:06:57.179 E/AndroidRuntime(25801): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:608)
07-17 23:06:57.179 E/AndroidRuntime(25801): at dalvik.system.NativeStart.main(Native Method)