Eclipse Java - Android app using serial do not work

I'm trying to use an app in Eclipse (v3.8), but it don't work. The API is 19, and the app is Serial_Port_1.1.apk

My method: (I'm new with eclipse)

• Extract the apk with apktool
• Import the folder with Eclipse
• Run as: Android application

I got theses errors:

threadid=1: thread exiting with uncaught exception (group=0xb3ac2ba8)
FATAL EXCEPTION: main
Process: android_serialport_api.sample, PID: 1508
java.lang.RuntimeException: Unable to instantiate application android_serialport_api.sample.Application: java.lang.ClassNotFoundException: Didn't find class "android_serialport_api.sample.Application" on path: DexPathList[[zip file "/data/app/android_serialport_api.sample-1.apk"],nativeLibraryDirectories=[/data/app-lib/android_serialport_api.sample-1, /vendor/lib, /system/lib]]
    at android.app.LoadedApk.makeApplication(LoadedApk.java:516)
    at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4317)

I'm trying to connect an Arduino to Eclipse, and the app works fine on a real system (ARM Orange Pi)