Solving native open cv code error in androd.mk for developing panorama on android

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I am trying to develop an android application for generating panoramic images usig feature of image stitching in Open CV.

I have used the code give on the site given below.

http://ramsrigoutham.com/2012/12/21/panorama-app-on-android-using-stitching-module-opencv/

There is an error shown in the log cat shown below. Please guide me how to solve the error.

This is the Native call for stitching images.

native.cpp

#include < jni.h >
#include <opencv2/core/core.hpp>
#include <opencv2/features2d/features2d.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/calib3d/calib3d.hpp>
#include <opencv2/stitching/stitcher.hpp>

#include < vector >
#include < iostream >
#include < stdio.h >
#include < list >
#include< sstream >
#include< string >

using namespace std;
using namespace cv;

extern "C" {
//JNIEXPORT Mat JNICALL Java_org_opencv_samples_tutorial3_Sample3Native_FindFeatures(JNIEnv*, jobject, jlong addrGray, jlong addrRgba)

JNIEXPORT void JNICALL Java_org_opencv_samples_tutorial3_Sample3Native_FindFeatures(
        JNIEnv*, jobject, jlong im1, jlong im2, jlong im3, jint no_images) {

    vector < Mat > imgs;
    bool try_use_gpu = false;
    // New testing
    Mat& temp1 = *((Mat*) im1);
    Mat& temp2 = *((Mat*) im2);
    Mat& pano = *((Mat*) im3);

    for (int k = 0; k < no_images; ++k) {
        string id;
        ostringstream convert;
        convert << k;
        id = convert.str();
        Mat img = imread("/storage/emulated/0/panoTmpImage/im" + id + ".jpeg");

        imgs.push_back(img);
    }

    Stitcher stitcher = Stitcher::createDefault(try_use_gpu);
    Stitcher::Status status = stitcher.stitch(imgs, pano);

}

}

This is the android.mk file which i have created having no idea on how to generate it.

Android.mk

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

include ../../android-development/OpenCV-2.4.10-android-sdk/OpenCV-2.4.10-android-sdk/sdk/native/jni/OpenCV.mk

LOCAL_MODULE    := native_activity
LOCAL_SRC_FILES := native.cpp
LOCAL_LDLIBS    += -lm -llog -landroid
LOCAL_STATIC_LIBRARIES += android_native_app_glue

include $(BUILD_SHARED_LIBRARY)

$(call import-module,android/native_app_glue)

And this is the Main Android code that has main GUI and calls the OpenCV function

Sample3Native.java

package org.opencv.samples.tutorial3;

import java.io.File;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import org.opencv.android.BaseLoaderCallback;
import org.opencv.android.CameraBridgeViewBase;
import org.opencv.android.CameraBridgeViewBase.CvCameraViewListener;
import org.opencv.android.LoaderCallbackInterface;
import org.opencv.android.OpenCVLoader;
import org.opencv.core.Core;
import org.opencv.core.CvType;
import org.opencv.core.Mat;
import org.opencv.core.Point;
import org.opencv.core.Scalar;
import org.opencv.highgui.Highgui;

import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;

public class Sample3Native extends Activity implements CvCameraViewListener {
    private static final String TAG = "OCVSample::Activity";

    public static final int VIEW_MODE_RGBA = 0;
    public static final int SAVE_IMAGE_MAT = 1;
    public static final int CAPT_STILL_IM = 2;
    private static int viewMode = VIEW_MODE_RGBA;
//  public static int image_count = 0;
    private MenuItem mStitch;
    private MenuItem mItemCaptureImage;
    private Mat mRgba;
    private Mat mGrayMat;
    private Mat panorama;
    private Mat mtemp;
    private List < Mat > images_to_be_stitched = new ArrayList < Mat >();
    private CameraBridgeViewBase mOpenCvCameraView;
    private long mPrevTime = new Date().getTime();
    private static final int FRAME2GRAB = 10;
    private int mframeNum = 0;
    private static ...