Получение FATAL исключения: AsyncTask # 1 при использовании класса Async

Я новичок в Android. Я импортировал проект, который снимает изображение со своего мобильного телефона и должен загрузить его на мой локальный компьютер в моем ноутбуке. Оба подключены к одному и тому же Wi-Fi, и он работает до тех пор, пока я не сделаю снимок и не нажму кнопку загрузки, но при нажатии кнопки загрузки происходит сбой. Это ошибки, которые я получаю в журнале регистрации. Может кто-нибудь помочь мне разобраться?

08-22 12:00:43.871: E/AndroidRuntime(2491): FATAL EXCEPTION: AsyncTask #1

08-22 12:00:43.871: E/AndroidRuntime(2491): java.lang.RuntimeException: An error occured while executing doInBackground()

08-22 12:00:43.871: E/AndroidRuntime(2491):     at android.os.AsyncTask$3.done(AsyncTask.java:278)

08-22 12:00:43.871: E/AndroidRuntime(2491):     at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)

08-22 12:00:43.871: E/AndroidRuntime(2491):     at java.util.concurrent.FutureTask.setException(FutureTask.java:124)

08-22 12:00:43.871: E/AndroidRuntime(2491):     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)

08-22 12:00:43.871: E/AndroidRuntime(2491):     at java.util.concurrent.FutureTask.run(FutureTask.java:137)

08-22 12:00:43.871: E/AndroidRuntime(2491):     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208)

08-22 12:00:43.871: E/AndroidRuntime(2491):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
08-22 12:00:43.871: E/AndroidRuntime(2491):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)

08-22 12:00:43.871: E/AndroidRuntime(2491):     at java.lang.Thread.run(Thread.java:856)

08-22 12:00:43.871: E/AndroidRuntime(2491): Caused by: java.lang.NoClassDefFoundError: info.androidhive.camerafileupload.AndroidMultiPartEntity

08-22 12:00:43.871: E/AndroidRuntime(2491):     at info.androidhive.camerafileupload.UploadActivity$UploadFileToServer.uploadFile(UploadActivity.java:156)

08-22 12:00:43.871: E/AndroidRuntime(2491):     at info.androidhive.camerafileupload.UploadActivity$UploadFileToServer.doInBackground(UploadActivity.java:145)

08-22 12:00:43.871: E/AndroidRuntime(2491):     at info.androidhive.camerafileupload.UploadActivity$UploadFileToServer.doInBackground(UploadActivity.java:1)

08-22 12:00:43.871: E/AndroidRuntime(2491):     at android.os.AsyncTask$2.call(AsyncTask.java:264)

08-22 12:00:43.871: E/AndroidRuntime(2491):     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)

08-22 12:00:43.871: E/AndroidRuntime(2491):     ... 5 more

пакет info.androidhive.camerafileupload;

   import  info.androidhive.camerafileupload.AndroidMultiPartEntity.ProgressListener;

import java.io.File;
import java.io.IOException;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.mime.content.FileBody;
import org.apache.http.entity.mime.content.StringBody;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.VideoView;

public class UploadActivity extends Activity {
// LogCat tag
private static final String TAG = MainActivity.class.getSimpleName();

private ProgressBar progressBar;
private String filePath = null;
private TextView txtPercentage;
private ImageView imgPreview;
private VideoView vidPreview;
private Button btnUpload;
long totalSize = 0;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_upload);
txtPercentage = (TextView) findViewById(R.id.txtPercentage);
btnUpload = (Button) findViewById(R.id.btnUpload);
progressBar = (ProgressBar) findViewById(R.id.progressBar);
imgPreview = (ImageView) findViewById(R.id.imgPreview);
vidPreview = (VideoView) findViewById(R.id.videoPreview);

// Changing action bar background color
getActionBar().setBackgroundDrawable(
new ColorDrawable(Color.parseColor(getResources().getString(
R.color.action_bar))));

// Receiving the data from previous activity
Intent i = getIntent();

// image or video path that is captured in previous activity
filePath = i.getStringExtra("filePath");

// boolean flag to identify the media type, image or video
boolean isImage = i.getBooleanExtra("isImage", true);

if (filePath != null) {
// Displaying the image or video on the screen
previewMedia(isImage);
} else {
Toast.makeText(getApplicationContext(),
"Sorry, file path is missing!", Toast.LENGTH_LONG).show();
}

btnUpload.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View v) {
// uploading the file to server
new UploadFileToServer().execute();
}
});

}

/**
* Displaying captured image/video on the screen
* */
private void previewMedia(boolean isImage) {
// Checking whether captured media is image or video
if (isImage) {
imgPreview.setVisibility(View.VISIBLE);
vidPreview.setVisibility(View.GONE);
// bimatp factory
BitmapFactory.Options options = new BitmapFactory.Options();

// down sizing image as it throws OutOfMemory Exception for larger
// images
options.inSampleSize = 8;

final Bitmap bitmap = BitmapFactory.decodeFile(filePath, options);

imgPreview.setImageBitmap(bitmap);
} else {
imgPreview.setVisibility(View.GONE);
vidPreview.setVisibility(View.VISIBLE);
vidPreview.setVideoPath(filePath);
// start playing
vidPreview.start();
}
}

/**
* Uploading the file to server
* */
private class UploadFileToServer extends AsyncTask<Void, Integer, String>
{

@Override
protected void onPreExecute() {
// setting progress bar to zero
progressBar.setProgress(0);
super.onPreExecute();
}

@Override
protected void onProgressUpdate(Integer... progress) {
// Making progress bar visible
progressBar.setVisibility(View.VISIBLE);

// updating progress bar value
progressBar.setProgress(progress[0]);

// updating percentage value
txtPercentage.setText(String.valueOf(progress[0]) + "%");
}

@Override
protected String doInBackground(Void... params) {
return uploadFile();
}

@SuppressWarnings("deprecation")
private String uploadFile() {
String responseString = null;

HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(Config.FILE_UPLOAD_URL);

try {
AndroidMultiPartEntity entity = new AndroidMultiPartEntity(
new ProgressListener() {

@Override
public void transferred(long num) {
publishProgress((int) ((num / (float) totalSize) * 100));
}
});

File sourceFile = new File(filePath);

// Adding file data to http body
entity.addPart("image", new FileBody(sourceFile));

// Extra parameters if you want to pass to server
entity.addPart("website",
new StringBody("www.androidhive.info"));
entity.addPart("email", new StringBody("[email protected]"));

totalSize = entity.getContentLength();
httppost.setEntity(entity);

// Making server call
HttpResponse response = httpclient.execute(httppost);
HttpEntity r_entity = response.getEntity();

int statusCode = response.getStatusLine().getStatusCode();
if (statusCode == 200) {
// Server response
responseString = EntityUtils.toString(r_entity);
} else {
responseString = "Error occurred! Http Status Code: "+ statusCode;
}

} catch (ClientProtocolException e) {
responseString = e.toString();
} catch (IOException e) {
responseString = e.toString();
}

return responseString;

}

@Override
protected void onPostExecute(String result) {
Log.e(TAG, "Response from server: " + result);

// showing the server response in an alert dialog
showAlert(result);

super.onPostExecute(result);
}

}

/**
* Method to show alert dialog
* */
private void showAlert(String message) {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage(message).setTitle("Response from Servers")
.setCancelable(false)
.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// do nothing
}
});
AlertDialog alert = builder.create();
alert.show();
}
}

это класс AndroidMultiPart

   package info.androidhive.camerafileupload;

import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.charset.Charset;

import org.apache.http.entity.mime.HttpMultipartMode;
import org.apache.http.entity.mime.MultipartEntity;

@SuppressWarnings("deprecation")
public class AndroidMultiPartEntity extends MultipartEntity

{

private final ProgressListener listener;

public AndroidMultiPartEntity(final ProgressListener listener) {
super();
this.listener = listener;
}

public AndroidMultiPartEntity(final HttpMultipartMode mode,
final ProgressListener listener) {
super(mode);
this.listener = listener;
}

public AndroidMultiPartEntity(HttpMultipartMode mode, final String  boundary,
final Charset charset, final ProgressListener listener) {
super(mode, boundary, charset);
this.listener = listener;
}

@Override
public void writeTo(final OutputStream outstream) throws IOException {
super.writeTo(new CountingOutputStream(outstream, this.listener));
}

public static interface ProgressListener {
void transferred(long num);
}

public static class CountingOutputStream extends FilterOutputStream {

private final ProgressListener listener;
private long transferred;

public CountingOutputStream(final OutputStream out,
final ProgressListener listener) {
super(out);
this.listener = listener;
this.transferred = 0;
}

public void write(byte[] b, int off, int len) throws IOException {
out.write(b, off, len);
this.transferred += len;
this.listener.transferred(this.transferred);
}

public void write(int b) throws IOException {
out.write(b);
this.transferred++;
this.listener.transferred(this.transferred);
}
}
}