App crashes when trying to access challenges 12 & 13

[tahersb]

AndroidRuntime E FATAL EXCEPTION: main
E Process: jakhar.aseem.diva, PID: 1155
E java.lang.UnsatisfiedLinkError: Couldn't load divajni from loader dalvik.system.PathClassLoader[DexPathList[[zip fi
le "/data/app/jakhar.aseem.diva-1.apk"],nativeLibraryDirectories=[/data/app-lib/jakhar.aseem.diva-1, /system/lib]]]
: findLibrary returned null
E at java.lang.Runtime.loadLibrary(Runtime.java:358)
E at java.lang.System.loadLibrary(System.java:526)
E at jakhar.aseem.diva.DivaJni.(DivaJni.java:43)
E at jakhar.aseem.diva.InputValidation3Activity.onCreate(InputValidation3Activity.java:49)
E at android.app.Activity.performCreate(Activity.java:5231)
E at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
E at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2148)
E at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2233)
E at android.app.ActivityThread.access$800(ActivityThread.java:135)
E at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
E at android.os.Handler.dispatchMessage(Handler.java:102)
E at android.os.Looper.loop(Looper.java:136)
E at android.app.ActivityThread.main(ActivityThread.java:5001)
E at java.lang.reflect.Method.invokeNative(Native Method)
E at java.lang.reflect.Method.invoke(Method.java:515)
E at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
E at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
E at dalvik.system.NativeStart.main(Native Method)

                       Process 1155 ended

[jehy]

native library was not found - did you compile it?

[z3dc0ps]

watch this video to clear all doubts: https://www.youtube.com/watch?v=PXvEh_QhGt8