Android java.lang.NoClassDefFoundError

[argz7]

I tried importing the new library to android, I fixed the gradle issues and it seems to compile alright.
But upon running, I get a java.lang.NoClassDefFoundError. I think I'm just missing something important to make it work. Any ideas?

The error is something like this:
java.lang.NoClassDefFoundError: Failed resolution of: Lcom/ripple/encodings/addresses/Addresses;
at com.ripple.crypto.Seed.(Seed.java:18)
at com.argz.testripplenewlib.MainActivity.onCreate(MainActivity.java:25)
at android.app.Activity.performCreate(Activity.java:6975)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1213)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2770)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6541)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)