org.json.JSONException: Value <br of type java.lang.String cannot be converted to JSONObject

<?php
$servername="127.0.0.1";
$username="root"
$password="";
$dbname="android";
$name=$_REQUEST["nme"];
$pass=$_REQUEST["pss"];

$con = @mysql_connect($servername,$username,$password) or die("connection failed");
@mysql_select_db($dbname,$con) or die("db selection failed");

$flag['code']=0;

if($r=@mysql_query("insert into testapp values('$name','$pass')",$con))
{
    $flag['code']=1;
}

print(json_encode($flag));
@mysql_close($con);
?>

package com.darkknight.connect;

import android.os.StrictMode;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONObject;

public class MainActivity extends AppCompatActivity {
EditText name,pass;
Button b1;
String a,b;
InputStream is;
String result=null,line=null;
int code;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    StrictMode.ThreadPolicy sp=new StrictMode.ThreadPolicy.Builder().permitAll().build();
    StrictMode.setThreadPolicy(sp);
    name=(EditText)findViewById(R.id.editText);
    pass=(EditText)findViewById(R.id.editText2);
    b1=(Button)findViewById(R.id.button);


    b1.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            a=name.getText().toString();
            b=pass.getText().toString();
            insert(a,b);
        }
    });
}

@SuppressWarnings("deprecation")

private void insert(String a,String b) {

    ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();

    nameValuePairs.add(new BasicNameValuePair("nme",a));
    nameValuePairs.add(new BasicNameValuePair("pss",b));

    try
    {
        HttpClient httpclient = new DefaultHttpClient();
        HttpPost httppost = new HttpPost("http://10.0.2.2/testapp/index.php");
        httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
        HttpResponse response = httpclient.execute(httppost);
        HttpEntity entity = response.getEntity();
        is = entity.getContent();
        Log.e("pass 1", "connection success ");
    }

    catch(Exception e)
    {
        Log.e("Fail 1", e.toString());
        Toast.makeText(getApplicationContext(), "Invalid IP Address",Toast.LENGTH_LONG).show();
    }

    try
    {
        BufferedReader reader = new BufferedReader(new InputStreamReader(is,"ISO-8859-1"));
        StringBuilder sb = new StringBuilder();

        while ((line = reader.readLine()) != null)
        {
            sb.append(line + "n");
        }
        is.close();
        result = sb.toString();
        Log.e("pass 2", "connection success ");
    }

    catch(Exception e)
    {
        Log.e("Fail 2", e.toString());
    }

    try
    {
        JSONObject json_data = new JSONObject(result);
        code=(json_data.getInt("code"));

        if(code==1)
        {
            Toast.makeText(getBaseContext(), "Inserted Successfully",Toast.LENGTH_SHORT).show();
        }
        else
        {
            Toast.makeText(getBaseContext(), "Sorry, Try Again",Toast.LENGTH_LONG).show();
        }
    }
    catch(Exception e)
    {
        Log.e("Fail 3", e.toString());
    }


}
}