Gradle error when i try to run my app. Any help would be appreciated. I have been following the tutorial code for code.

Here is my source code:

package com.jerdeez.blogreader;

import android.app.AlertDialog;
import android.app.ListActivity;
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.AsyncTask;
import android.os.Bundle;
import android.text.Html;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ProgressBar;
import android.widget.SimpleAdapter;
import android.widget.TextView;
import android.widget.Toast;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;


public class MainListActivity extends ListActivity {


    public static final int NUMBER_OF_POSTS = 20;
    public static final String TAG = MainListActivity.class.getSimpleName();
    protected JSONObject mBlogData;
    protected ProgressBar mProgressBar;


    private final String KEY_TITLE ="title";
    private final String KEY_AUTHOR ="author";


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main_list);

        mProgressBar = (ProgressBar)findViewById(R.id.progressBar1);

        if (isNetworkAvailable()) {
            mProgressBar.setVisibility(View.VISIBLE);
            GetBlogPostsTask getBlogPostsTask = new GetBlogPostsTask();
            getBlogPostsTask.execute();
            //Toast.makeText(this, getString(R.string.no_items),Toast.LENGTH_LONG).show();
        } else {
            Toast.makeText(this, "Network is unavailable!", Toast.LENGTH_LONG).show();
        }

    }

    private boolean isNetworkAvailable() {
        ConnectivityManager manager = (ConnectivityManager)
                getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo networkInfo = manager.getActiveNetworkInfo();

        boolean isAvailable = false;
        if (networkInfo != null && networkInfo.isConnected()) {
            isAvailable = true;
        }

        return isAvailable;
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main_list, menu);
        return true;
    }

    public void handleBlogresponse() {
        mProgressBar.setVisibility(View.INVISIBLE);
        if (mBlogData == null) {
            updateDisplayForError();
        }
        else{
            try {
                JSONArray jsonPost = mBlogData.getJSONArray("posts");
                //JSONArray jsonPost = mBlogData.getJSONArray("post");
                ArrayList<HashMap<String, String>> blogPost = new ArrayList<HashMap<String, String>>();
                for (int i =0; i<jsonPost.length(); i++){
                 JSONObject post = jsonPost.getJSONObject(i);
                 String title = post.getString(KEY_TITLE);
                 title = Html.fromHtml(title).toString();
                 String author = post.getString(KEY_AUTHOR);
                 author = Html.fromHtml(author).toString();

                 HashMap<String, String> blogPost = new HashMap<String, String>();
                 blogPost.put(KEY_TITLE, title);
                 blogPost.put(KEY_AUTHOR, author);


                 blogPosts.add(blogPost);

                }
                   String [] keys = {KEY_TITLE, KEY_AUTHOR};
                   int [] ids ={android.R.id.text1, android.R.id.text2};
                SimpleAdapter adapter = new SimpleAdapter(this, blogPosts,
                        android.R.layout.simple_list_item_2, keys, ids);


                        setListAdapter(adapter);
            }
            catch (JSONException e) {
                Log.e(TAG, "Exception Caught!", e);
            }
        }

    }

    private void updateDisplayForError() {
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle(getString(R.string.error_title));
        builder.setMessage(getString(R.string.error_message));
        builder.setPositiveButton(android.R.string.ok, null);
        AlertDialog dialog = builder.create();
        dialog.show();

        TextView emptyTextView = (TextView) getListView().getEmptyView();
        emptyTextView.setText(getString(R.string.no_items));
    }


    private class GetBlogPostsTask extends AsyncTask<Object, Void, JSONObject> {

        @Override
        protected JSONObject doInBackground(Object[] objects) {
            int responseCode = -1;
            JSONObject jsonResponse = null;

            try {
                //URL blogFeedUrl = new URL("http://blog.teamtreehouse.com/api/get_recent_summary/?count =" + NUMBER_OF_POSTS);
                URL blogFeedUrl = new URL("http://blog.teamtreehouse.com/api/get_recent_summary/?count=" + NUMBER_OF_POSTS);
                HttpURLConnection connection = (HttpURLConnection) blogFeedUrl.openConnection();
                connection.connect();

                //Creating are response code so that we can get data from the internet
                responseCode = connection.getResponseCode();
                if (responseCode == HttpURLConnection.HTTP_OK) {
                    InputStream inputStream = connection.getInputStream(); //store the data into the input stream
                    Reader reader = new InputStreamReader(inputStream);//read the input stream
                    int contentLength = connection.getContentLength();//get the number of characters to read in
                    char[] charArray = new char[contentLength];//create the char array to store the the data
                    reader.read(charArray); //read and store the data array into the char array
                    String responseData = new String(charArray);//create a new string and convert and store from char to string

                    //This creates are Json object
                    jsonResponse = new JSONObject(responseData);


                }


                //} else {
                //Log.i(TAG, "Unsuccessful HTTP Response Code: " + responseCode);
                //}
                Log.i(TAG, "Code: " + responseCode);
            } catch (MalformedURLException e) {
                //e.printStackTrace();
                Log.e(TAG, "Exception caught: ", e);
            } catch (IOException e) {
                Log.e(TAG, "Exception caught: ", e);

            } catch (Exception e) {
                Log.e(TAG, "Exception caught: ", e);
            }


            return jsonResponse;
        }

        @Override
        protected void onPostExecute(JSONObject result) {
            mBlogData = result;
            handleBlogresponse();

        }


    }

}

Here is my Gradle build error:

Total time: 6.461 secs
Executing tasks: [:app:assembleDebug]

Configuration on demand is an incubating feature.
Relying on packaging to define the extension of the main artifact has been deprecated and is scheduled to be removed in Gradle 2.0
:app:preBuild
:app:compileDebugNdk UP-TO-DATE
:app:preDebugBuild
:app:checkDebugManifest
:app:preReleaseBuild
:app:prepareComAndroidSupportAppcompatV72000Library UP-TO-DATE
:app:prepareComAndroidSupportSupportV42000Library UP-TO-DATE
:app:prepareDebugDependencies
:app:compileDebugAidl UP-TO-DATE
:app:compileDebugRenderscript UP-TO-DATE
:app:generateDebugBuildConfig UP-TO-DATE
:app:generateDebugAssets UP-TO-DATE
:app:mergeDebugAssets UP-TO-DATE
:app:generateDebugResValues UP-TO-DATE
:app:generateDebugResources UP-TO-DATE
:app:mergeDebugResources UP-TO-DATE
:app:processDebugManifest UP-TO-DATE
:app:processDebugResources UP-TO-DATE
:app:generateDebugSources UP-TO-DATE
:app:compileDebugJava
C:\Users\Owner-1\AndroidStudioProjects\BlogReader\app\src\main\java\com\jerdeez\blogreader\MainListActivity.java:104: error: variable blogPost is already defined in method handleBlogresponse()
                 HashMap<String, String> blogPost = new HashMap<String, String>();
                                         ^
C:\Users\Owner-1\AndroidStudioProjects\BlogReader\app\src\main\java\com\jerdeez\blogreader\MainListActivity.java:109: error: cannot find symbol
                 blogPosts.add(blogPost);
                 ^
  symbol:   variable blogPosts
  location: class MainListActivity
C:\Users\Owner-1\AndroidStudioProjects\BlogReader\app\src\main\java\com\jerdeez\blogreader\MainListActivity.java:114: error: cannot find symbol
                SimpleAdapter adapter = new SimpleAdapter(this, blogPosts,
                                                                ^
  symbol:   variable blogPosts
  location: class MainListActivity
3 errors

 FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:compileDebugJava'.
> Compilation failed; see the compiler error output for details.

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

BUILD FAILED

Total time: 3.896 secs