I downloaded the Getac Z710 Android tablet RFID library/jar from there web site. But after I called the init function:

05-19 19:23:45.315: E/AndroidRuntime(2469): FATAL EXCEPTION: main
05-19 19:23:45.315: E/AndroidRuntime(2469): java.lang.ExceptionInInitializerError
05-19 19:23:45.315: E/AndroidRuntime(2469):  at com.getac.lib.rfidreader.RfidTagReaderAPI.InitRFIDReader(RfidTagReaderAPI.java:118)
05-19 19:23:45.315: E/AndroidRuntime(2469):  at shipadmin.musterstation.no.MainActivity.onCreate(MainActivity.java:104)
05-19 19:23:45.315: E/AndroidRuntime(2469):  at android.app.Activity.performCreate(Activity.java:5008)
05-19 19:23:45.315: E/AndroidRuntime(2469):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
05-19 19:23:45.315: E/AndroidRuntime(2469):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)
05-19 19:23:45.315: E/AndroidRuntime(2469):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
05-19 19:23:45.315: E/AndroidRuntime(2469):  at android.app.ActivityThread.access$600(ActivityThread.java:130)
05-19 19:23:45.315: E/AndroidRuntime(2469):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
05-19 19:23:45.315: E/AndroidRuntime(2469):  at android.os.Handler.dispatchMessage(Handler.java:99)
05-19 19:23:45.315: E/AndroidRuntime(2469):  at android.os.Looper.loop(Looper.java:137)
05-19 19:23:45.315: E/AndroidRuntime(2469):  at android.app.ActivityThread.main(ActivityThread.java:4745)
05-19 19:23:45.315: E/AndroidRuntime(2469):  at java.lang.reflect.Method.invokeNative(Native Method)
05-19 19:23:45.315: E/AndroidRuntime(2469):  at java.lang.reflect.Method.invoke(Method.java:511)
05-19 19:23:45.315: E/AndroidRuntime(2469):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
05-19 19:23:45.315: E/AndroidRuntime(2469):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
05-19 19:23:45.315: E/AndroidRuntime(2469):  at dalvik.system.NativeStart.main(Native Method)
05-19 19:23:45.315: E/AndroidRuntime(2469): Caused by: java.lang.UnsatisfiedLinkError: Couldn't load serial_port: findLibrary returned null
05-19 19:23:45.315: E/AndroidRuntime(2469):  at java.lang.Runtime.loadLibrary(Runtime.java:365)
05-19 19:23:45.315: E/AndroidRuntime(2469):  at java.lang.System.loadLibrary(System.java:538)
05-19 19:23:45.315: E/AndroidRuntime(2469):  at android_serialport_api.SerialPort.<clinit>(SerialPort.java:69)
05-19 19:23:45.315: E/AndroidRuntime(2469):  ... 16 more

I tried other solutions for this, but still no luck. What would be the problem? They only have a limited documentation and support. TIA.