i am creating a login application that need connection between php mysql but the system display an error that say :

03-23 19:52:24.313: E/JSON Parser(7221): Error parsing data org.json.JSONException: Value <br of type java.lang.String cannot be converted to JSONObject

how to fix this error ?? i know that the error is that response that i get from the php file but i do not know where i did not find it.

the add user it work fine and i can insert users , but i can not select from it.

login.php

<?php
//array for JSON response
$response = array();

// check for required fields
if (isset($_POST['user']) && isset($_POST['password']) ) {

    $user = $_POST['user'];
    $password = $_POST['password'];


    // include db connect class
    require_once '/db_connect.php';

    // connecting to db
    $db = new DB_CONNECT();

    // mysql inserting a new row
    $sql = mysql_query("Select user, password FROM users WHERE user = '$user'")or die(mysql_error());
    $count_query = mysql_num_rows($query);
    if($sql){
     $response["success"] = 0;
        $response["message"] = "Wrong User Or Pass";

        // echoing JSON response
        echo json_encode($response);
    }
     else{
        $response["success"] = 1;
        $response["message"] = "correct Informations";

        // echoing JSON response
        echo json_encode($response);
    }
}
else {
    // required field is missing
    $response["success"] = 0;
    $response["message"] = "Required field(s) is missing";

    // echoing JSON response
    echo json_encode($response);
}   
?>

MainActivity.java

package com.example.dvr;

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

import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
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.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends Activity {

    // Progress Dialog
    private ProgressDialog pDialog;

    JSONParser jsonParser = new JSONParser();
    EditText username_edt;
    EditText pass_edt;

    // url to creaate new product
    private static String url_create_user = "http://10.0.3.2/android_connect/adduser.php";
    private static String url_login_user = "http://10.0.3.2/android_connect/login.php";

    // JSON Node names
    private static final String TAG_SUCCESS = "success";

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

        // Edit Text
        username_edt = (EditText) findViewById(R.id.editText1);
        pass_edt = (EditText) findViewById(R.id.editText2);
        // inputDesc = (EditText) findViewById(R.id.inputDesc);

        // Create button
        Button btnCreateProduct = (Button) findViewById(R.id.btnlogin);

        // button click event
        btnCreateProduct.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View view) {
                // creating new product in background thread
                new CreateNewProduct().execute();
            }
        });

        // Login button
        Button loginBtn = (Button) findViewById(R.id.btn_login);

        // button click event
        loginBtn.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View view) {
                // creating new product in background thread
                new login().execute();

                Toast.makeText(getBaseContext(),
                        username_edt.toString() + pass_edt.toString(),
                        Toast.LENGTH_SHORT).show();
            }
        });

    }

    /**
     * Selecting Users
     * */

    class login extends AsyncTask<String, String, String> {

        /**
         * Before starting background thread Show Progress Dialog
         * */
        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            pDialog = new ProgressDialog(MainActivity.this);
            pDialog.setMessage("Creating Product..");
            pDialog.setIndeterminate(false);
            pDialog.setCancelable(true);
            pDialog.show();
        }

        /**
         * Creating product
         * */
        protected String doInBackground(String... args) {
            String user = username_edt.getText().toString();
            String password = pass_edt.getText().toString();
            // String description = inputDesc.getText().toString();

            // Building Parameters
            List<NameValuePair> params = new ArrayList<NameValuePair>();
            params.add(new BasicNameValuePair("user", user));
            params.add(new BasicNameValuePair("password", password));
            // params.add(new BasicNameValuePair("description", description));

            // getting JSON Object
            // Note that create product url accepts POST method
            JSONObject json = jsonParser.makeHttpRequest(url_login_user,
                    "POST", params);

            // check log cat from response
        //  Log.d("Create Response", json.toString());

            // check for success tag
            try {
                int success = json.getInt(TAG_SUCCESS);

                if (success == 1) {

                    finish();

                } else {
                    // failed
                }
            } catch (JSONException e) {
                e.printStackTrace();
            }

            return null;
        }

        /**
         * After completing background task Dismiss the progress dialog
         * **/
        protected void onPostExecute(String file_url) {
            // dismiss the dialog once done
            pDialog.dismiss();

        }

    }

    /**
     * Background Async Task to Create new product
     * */
    class CreateNewProduct extends AsyncTask<String, String, String> {

        /**
         * Before starting background thread Show Progress Dialog
         * */
        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            pDialog = new ProgressDialog(MainActivity.this);
            pDialog.setMessage("Creating Product..");
            pDialog.setIndeterminate(false);
            pDialog.setCancelable(true);
            pDialog.show();
        }

        /**
         * Creating product
         * */
        protected String doInBackground(String... args) {
            String user = username_edt.getText().toString();
            String password = pass_edt.getText().toString();
            // String description = inputDesc.getText().toString();

            // Building Parameters
            List<NameValuePair> params = new ArrayList<NameValuePair>();
            params.add(new BasicNameValuePair("user", user));
            params.add(new BasicNameValuePair("password", password));
            // params.add(new BasicNameValuePair("description", description));

            // getting JSON Object
            // Note that create product url accepts POST method
            JSONObject json = jsonParser.makeHttpRequest(url_create_user,
                    "POST", params);

            // check log cat from response
            Log.d("Create Response", json.toString());

            // check for success tag
            try {
                int success = json.getInt(TAG_SUCCESS);

                if (success == 1) {

                    finish();

                } else {
                    // failed
                }
            } catch (JSONException e) {
                e.printStackTrace();
            }

            return null;
        }

        /**
         * After completing background task Dismiss the progress dialog
         * **/
        protected void onPostExecute(String file_url) {
            // dismiss the dialog once done
            pDialog.dismiss();
        }

    }
}