我已经下载了 openCV 库。现在，当我尝试运行示例 faceDetection 应用程序时，它显示以下错误：
08-11 15:59:55.071: E/AndroidRuntime(13837): FATAL EXCEPTION: main
08-11 15:59:55.071: E/AndroidRuntime(13837): java.lang.UnsatisfiedLinkError: Couldn't load detection_based_tracer: findLibrary returned null
08-11 15:59:55.071: E/AndroidRuntime(13837): at java.lang.Runtime.loadLibrary(Runtime.java:429)
08-11 15:59:55.071: E/AndroidRuntime(13837): at java.lang.System.loadLibrary(System.java:554)
08-11 15:59:55.071: E/AndroidRuntime(13837): at com.kratin.opencvfacedetection.FdActivity$1.onManagerConnected(FdActivity.java:36)
08-11 15:59:55.071: E/AndroidRuntime(13837): at org.opencv.android.AsyncServiceHelper$1.onServiceConnected(AsyncServiceHelper.java:206)
08-11 15:59:55.071: E/AndroidRuntime(13837): at android.app.LoadedApk$ServiceDispatcher.doConnected(LoadedApk.java:1064)
08-11 15:59:55.071: E/AndroidRuntime(13837): at android.app.LoadedApk$ServiceDispatcher$RunConnection.run(LoadedApk.java:1081)
08-11 15:59:55.071: E/AndroidRuntime(13837): at android.os.Handler.handleCallback(Handler.java:587)
08-11 15:59:55.071: E/AndroidRuntime(13837): at android.os.Handler.dispatchMessage(Handler.java:92)
08-11 15:59:55.071: E/AndroidRuntime(13837): at android.os.Looper.loop(Looper.java:130)
08-11 15:59:55.071: E/AndroidRuntime(13837): at android.app.ActivityThread.main(ActivityThread.java:3701)
08-11 15:59:55.071: E/AndroidRuntime(13837): at java.lang.reflect.Method.invokeNative(Native Method)
08-11 15:59:55.071: E/AndroidRuntime(13837): at java.lang.reflect.Method.invoke(Method.java:507)
08-11 15:59:55.071: E/AndroidRuntime(13837): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866)
08-11 15:59:55.071: E/AndroidRuntime(13837): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:624)
08-11 15:59:55.071: E/AndroidRuntime(13837): at dalvik.system.NativeStart.main(Native Method)
但是预编译的 facedetection.apk 运行没有任何问题。那么当我从示例应用程序运行它时出了什么问题？请帮帮我..我正在使用 ubuntu 操作系统。