Android compile library error

I'm try using library NCHART3D

My build.gradle

android {
    compileSdkVersion 21
    buildToolsVersion "21.1.2"

    defaultConfig {
        applicationId "com.example.android.test3dchart"
        minSdkVersion 16
        targetSdkVersion 21
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.android.support:appcompat-v7:21.0.3'
    compile files('libs/NChart3D.jar')
}

and logcat print :

Couldn't load nchart3d from loader dalvik.system.PathClassLoader[DexPathList[[zip file "/data/app/com.example.android.test3dchart-2.apk"],nativeLibraryDirectories=[/data/app-lib/com.example.android.test3dchart-2, /vendor/lib, /system/lib]]]: findLibrary returned null

01-15 13:29:50.177    2793-2793/com.example.android.chart D/dalvikvm﹕ Late-enabling CheckJNI
01-15 13:29:50.267    2793-2793/com.example.android.chart W/dalvikvm﹕ Exception Ljava/lang/UnsatisfiedLinkError; thrown while initializing Lcom/nulana/NChart/NChartView;
01-15 13:29:50.267    2793-2793/com.example.android.chart W/dalvikvm﹕ Class init failed in Constructor.constructNative (Lcom/nulana/NChart/NChartView;)
01-15 13:29:50.267    2793-2793/com.example.android.chart D/AndroidRuntime﹕ Shutting down VM
01-15 13:29:50.267    2793-2793/com.example.android.chart W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0x415778b0)
01-15 13:29:50.277    2793-2793/com.example.android.chart E/AndroidRuntime﹕ FATAL EXCEPTION: main

UPDATE in xml preview

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <com.nulana.NChart.NChartView
        android:id="@+id/surface"
        android:layout_height="fill_parent"
        android:layout_width="fill_parent"/>
</LinearLayout>

Rendering Problems The following classes could not be found: - com.nulana.NChart.NChartView (Fix Build Path, Create Class) Tip: Try to build the project.