VolleyError null dönüyor

Merhaba

Uygulamamda Volley ile veri çekmeye çalışıyorum.Sorunum URL'ye bağlanmaktan ziyade veriyi çekememek.JsonArrayRequest oluştururken hata alıyorum.Nerede hata yapıyorum?

[code]EtkinlikActivity.java

package com.monat.bitirme.anamenu;

import java.util.ArrayList;
import java.util.List;

import org.apache.http.NameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.JsonObjectRequest;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import com.monat.bitirme.MySQL.AppController;
import com.monat.bitirme.MySQL.JSONParser;
import com.monat.bitirme.R;
import com.monat.bitirme.adapter.EtkinlikTakvimiAdapter;
import com.monat.bitirme.model.Etkinlik;
import com.android.volley.AuthFailureError;
import com.android.volley.Request.Method;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.VolleyLog;
import com.android.volley.toolbox.JsonArrayRequest;
import com.android.volley.toolbox.JsonObjectRequest;

public class EtkinlikTakvimiActivity extends Activity {

    ListView lv;

    private String jsonResponse;

    private ProgressDialog pDialog;

    TextView tv;

    ArrayList<Etkinlik> etkinlikList;

    private static String url_tum_etkinlikler = "http://10.0.3.2/Bitirme/get_tum_etkinlikler.php";

    // JSON Node names
    private static final String TAG_SUCCESS = "success";
    private static final String TAG_ETKINLIKLER = "etkinlikler";
    private static final String TAG_ID = "id";
    private static final String TAG_AD = "ad";
    private static final String TAG_YER = "yer";
    private static final String TAG_TARIH = "tarih";
    private static final String TAG_BASLANGIC_SAATI = "baslangicsaati";
    private static final String TAG_BITIS_SAATI = "bitissaati";

    JSONArray etkinlikler = null;

    private RequestQueue mRequestQueue;

    String TAG;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_etkinlik_takvimi);

        tv=(TextView)findViewById(R.id.textView14);

        etkinlikList = new ArrayList<Etkinlik>();

        lv = (ListView) findViewById(R.id.lvEtkinlikTakvimi);

        pDialog = new ProgressDialog(this);
        pDialog.setMessage("Please wait...");
        pDialog.setCancelable(false);

        makeJsonArrayRequest();

    }

    private void makeJsonArrayRequest() {

        showpDialog();

        JsonArrayRequest req = new JsonArrayRequest(url_tum_etkinlikler,
                new Response.Listener<JSONArray>() {
                    @Override
                    public void onResponse(JSONArray response) {
                        Log.d(TAG_ETKINLIKLER, response.toString());

                        try {
                            // Parsing json array response
                            // loop through each json object
                            jsonResponse = "";
                            for (int i = 0; i < response.length(); i++) {

                                JSONObject person = (JSONObject) response
                                        .get(i);

                                String _id = person.getString("_id");
                                String ad = person.getString("ad");
                                String yer = person.getString("yer");
                                String tarih = person.getString("tarih");
                                String baslangicsaati = person.getString("baslangicsaati");
                                String bitissaati = person.getString("bitissaati");

                                jsonResponse += "Name: " + _id + "\n";
                                jsonResponse += "Email: " + ad + "\n";
                                jsonResponse += "Home: " + yer + "\n";
                                jsonResponse += "Mobile: " + tarih + "\n";
                                jsonResponse += "Mobile: " + baslangicsaati + "\n";
                                jsonResponse += "Mobile: " + bitissaati + "\n";

                            }

                            tv.setText(jsonResponse);

                        } catch (JSONException e) {
                            e.printStackTrace();
                            Toast.makeText(getApplicationContext(),
                                    "Error: " + e.getMessage(),
                                    Toast.LENGTH_LONG).show();
                        }

                        hidepDialog();
                    }
                }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                VolleyLog.d(TAG_ETKINLIKLER, "Error: " + error.getMessage());
                Toast.makeText(getApplicationContext(),
                        "ee"+error.getMessage(), Toast.LENGTH_SHORT).show();
                hidepDialog();
            }
        });

        // Adding request to request queue
        AppController.getInstance().addToRequestQueue(req);
    }

    private void showpDialog() {
        if (!pDialog.isShowing())
            pDialog.show();
    }

    private void hidepDialog() {
        if (pDialog.isShowing())
            pDialog.dismiss();
    }

}

[/code]

AppController.java

[code]package com.monat.bitirme.MySQL;

        import android.app.Application;
        import android.text.TextUtils;

        import com.android.volley.Request;
        import com.android.volley.RequestQueue;
        import com.android.volley.toolbox.Volley;

public class AppController extends Application {

    public static final String TAG = AppController.class.getSimpleName();

    private RequestQueue mRequestQueue;

    private static AppController mInstance;

    @Override
    public void onCreate() {
        super.onCreate();
        mInstance = this;
    }

    public static synchronized AppController getInstance() {
        return mInstance;
    }

    public RequestQueue getRequestQueue() {
        if (mRequestQueue == null) {
            mRequestQueue = Volley.newRequestQueue(getApplicationContext());
        }

        return mRequestQueue;
    }

    public <T> void addToRequestQueue(Request<T> req, String tag) {
        req.setTag(TextUtils.isEmpty(tag) ? TAG : tag);
        getRequestQueue().add(req);
    }

    public <T> void addToRequestQueue(Request<T> req) {
        req.setTag(TAG);
        getRequestQueue().add(req);
    }

    public void cancelPendingRequests(Object tag) {
        if (mRequestQueue != null) {
            mRequestQueue.cancelAll(tag);
        }
    }
}[/code]