Problem of building Android module using external library FFmpegMediaPlayer

I have developed Android module using external library FFmpegMediaPlayer. I successfully packaged the module. However, when I used that module in my project, I got the following error message.

[ERROR] :  FFmpegMediaPlayer: FFmpegMediaPlayer libraries not found. Did you forget to add them to your libs folder?
[WARN] :   dalvikvm: Exception Ljava/lang/UnsatisfiedLinkError; thrown while initializing Lwseemann/media/FFmpegMediaPlayer;
[WARN] :   W/System.err: java.lang.ExceptionInInitializerError
[WARN] :   W/System.err:    at com.ekhmer.ffmpeg.FfmpegandroidModule.startPlay(FfmpegandroidModule.java:100)
[WARN] :   W/System.err:    at org.appcelerator.kroll.runtime.v8.V8Object.nativeFireEvent(Native Method)
[WARN] :   W/System.err:    at org.appcelerator.kroll.runtime.v8.V8Object.fireEvent(V8Object.java:64)
[WARN] :   W/System.err:    at org.appcelerator.kroll.KrollProxy.doFireEvent(KrollProxy.java:884)
[WARN] :   W/System.err:    at org.appcelerator.kroll.KrollProxy.handleMessage(KrollProxy.java:1107)
[WARN] :   W/System.err:    at org.appcelerator.titanium.proxy.TiViewProxy.handleMessage(TiViewProxy.java:347)
[WARN] :   W/System.err:    at android.os.Handler.dispatchMessage(Handler.java:95)
[WARN] :   W/System.err:    at android.os.Looper.loop(Looper.java:137)
[WARN] :   W/System.err:    at org.appcelerator.kroll.KrollRuntime$KrollRuntimeThread.run(KrollRuntime.java:112)
[WARN] :   W/System.err: Caused by: java.lang.UnsatisfiedLinkError
[WARN] :   W/System.err:    at wseemann.media.FFmpegMediaPlayer.<clinit>(FFmpegMediaPlayer.java:600)

I look for the code in wseemann.media.FFmpegMediaPlayer at line 600. The error happened in this line. I put "libavutil.so", "libavcodec.so", "libavformat.so", "libswresample.so", "libffmpeg_mediaplayer_jni.so" in libs folder of module projects. However, I don't know what is the problem. I appreciate if anyone can help. Thanks