Android : Post request not responding for an android app

I'm trying to make a POST request function in android I’ve made all thing right but the request its display an error. This the exemple

This the doBackground function.

//doInBackground
 private final String mEmail;
    private final String mPassword;
    String url = "index.php/services/UserLogin";

    LoginTask(String email, String password) {
        mEmail = email;
        mPassword = password;
    }

    @Override
    protected Boolean doInBackground(Void... params) {
        // TODO: attempt authentication against a network service.

        try {
            // Simulate network access.
            Thread.sleep(2000);
        } catch (InterruptedException e) {
            return false;
        }

        ArrayList<BasicNameValuePair> nameValuePairs = new          ArrayList<BasicNameValuePair>();
        nameValuePairs.add(new BasicNameValuePair("email", mEmail));
        nameValuePairs.add(new BasicNameValuePair("password", mPassword));

        //Prepare the Post query

        try {
            HttpClient clientHttp = new DefaultHttpClient();
            HttpPost httppost = new HttpPost(url);
            httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
            HttpResponse response = clientHttp.execute(httppost);
            HttpEntity entity = response.getEntity();
            InputStream is = entity.getContent();
            BufferedReader reader = new BufferedReader(new InputStreamReader(is,"iso-8859-1"),8);
            StringBuilder sb = new StringBuilder();
            String line = reader.readLine();
            sb.append(line + "\n");
            is.close();

            String result = sb.toString();
            System.out.println(result);

        }catch (Exception e){

            return false;
        }


        // TODO: register the new account here.
        return true;
    }

and this is the doPost function :

 //onPostExecute 
protected void onPostExecute(final Boolean success) {
        //LoginTask = null;
        //showProgress(false);
        if (success) {
            finish();
        } else {
            //password.setError(getString(R.string.error_incorrect_password));
            //password.requestFocus();

            AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
            builder.setTitle("Erreur !");
            builder.setMessage("Les informations entrées sont incorrectes.\nVeuillez réessayer!")
                    .setCancelable(false)
                    .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int id) {
                            dialog.cancel();
                        }
                    });
            AlertDialog alert = builder.create();
            alert.show();
        }
    }

So have you seen any error in my code thanks for the help !