Eu estou tentando fazer uma página de registro de uma atividade android connectiong os dados para o meu sqldatabase, estou recebendo este erro "org.json.JSONException: Value

Primeiro de tudo, alguém poderia me aconselhar sobre como depurar o meu programa ao usar um banco de dados mysql com script PHP para uma aplicação android? Porque eu costumo usar o gato de log, mas aqui os erros não são tão claros: S ...

Aqui está o código da atividade:

<code>public class Subscribe extends Activity {

    Button bSubscribe;
    EditText etPwdSub, etPwdConf, etLoginSub, etNameSub, etFnSub;
    String result = null;
    InputStream is = null;
    String donnees = "";

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.subscribe);

        etLoginSub = (EditText) findViewById(R.id.etLoginSub);
        etPwdSub = (EditText) findViewById(R.id.etPwdSub);
        etPwdConf = (EditText) findViewById(R.id.etPwdConf);
        etNameSub = (EditText) findViewById(R.id.etNameSub);
        etFnSub = (EditText) findViewById(R.id.etFnSub);

        bSubscribe = (Button) findViewById(R.id.bSubscribe);        
        bSubscribe.setOnClickListener(new View.OnClickListener() {

            public void onClick(View v) {

                Pattern p = Pattern.compile(".+@.+\\.[a-z]+");
                Matcher m = p.matcher(etLoginSub.getEditableText());

                if (m.matches() == false) {

                    Toast.makeText(
                            getBaseContext(),
                            "Le champs email ne correspond pas au format d'une adresse mail",
                            Toast.LENGTH_SHORT).show();
                } else {

                    // autre méthode : etPwdSub.equals("")
                    if (etPwdSub.getEditableText() != null
                            && etPwdConf.getEditableText() != null
                            && etNameSub.getEditableText() != null
                            && etFnSub.getEditableText() != null) {

                        if (etPwdSub.getEditableText().toString().equals(etPwdConf.getEditableText().toString())) {

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

                            nameValuePairs.add(new BasicNameValuePair("login", etLoginSub.getText().toString()));
                            nameValuePairs.add(new BasicNameValuePair("pwd", etPwdConf.getText().toString()));
                            nameValuePairs.add(new BasicNameValuePair("name", etNameSub.getText().toString()));
                            nameValuePairs.add(new BasicNameValuePair("firstname", etFnSub.getText().toString()));                          

                            try {
                                // commandes httpClient
                                HttpClient httpclient = new DefaultHttpClient();


                                HttpPost httppost = new HttpPost(
                                        "http://192.168.1.101/spotnshare/subscribe.php");

                                httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

                                HttpResponse response = httpclient.execute(httppost);

                                HttpEntity entity = response.getEntity();
                                is = entity.getContent();

                            } catch (Exception e) {
                                Log.i("taghttppost", "" + e.toString());
                                Toast.makeText(getBaseContext(), e.toString(), Toast.LENGTH_LONG)
                                        .show();
                            }

                            try {
                                BufferedReader reader = new BufferedReader(new InputStreamReader(
                                        is, "UTF-8"));

                                StringBuilder sb = new StringBuilder();

                                String line = null;

                                while ((line = reader.readLine()) != null) {
                                    sb.append(line + "\n");
                                }

                                is.close();

                                result = sb.toString();
                            } catch (Exception e) {
                                Log.i("tagconvertstr", "" + e.toString());
                            }

                            try {
                                JSONObject jObj = new JSONObject(result);

                                    donnees = jObj.getString("message");

                                    Intent ourIntent = new Intent(Subscribe.this,
                                            SubscribeMess.class);

                                    // objet qui vas nous permettre de passe des variables ici la
                                    // variable passInfo
                                    Bundle objetbunble = new Bundle();          
                                    objetbunble.putString("message", donnees);
                                    ourIntent.putExtras(objetbunble);               // on passe notre objet dans l'intent

                                    // on appelle notre activité
                                    startActivity(ourIntent);                                   

                            } catch (JSONException e) {
                                Log.i("tagjsonexp", "" + e.toString());
                            } catch (ParseException e) {
                                Log.i("tagjsonpars", "" + e.toString());
                            }


                        } else {
                            Dialog d = new Dialog(Subscribe.this);
                            d.setTitle(etPwdSub.getEditableText() +" "+etPwdConf.getEditableText());
                            d.show();
                        }

                    } else {
                        Dialog d = new Dialog(Subscribe.this);
                        d.setTitle("Fill in all the fields !");
                        d.show();
                    }

                }
            }
        });

    }

    protected void onPause() {
        super.onPause();
        finish();
    }
}
</code>

e aqui está o script php:

<code><?php

if( isset($_POST['login']) && isset($_POST['pwd']) && isset($_POST['name']) && isset($_POST['firstname'])) {

    include("connexion_bdd.php");

    if(connexionBDD() == 1){

        $login = $_POST['login'];
        $pwd = $_POST['pwd'];
        $name = $_POST['name'];
        $firstname = $_POST['firstname'];

        $sql = "SELECT colUserID
                FROM userTable 
                WHERE colUserLogin = '".$login."' ";

        $req = mysql_query($sql);
        $resultat=mysql_num_rows($req); 

        if($resultat==0){
            $temps = time();
            $clef = md5($login . $temps);

            $req = mysql_query("INSERT INTO userTable(colUserLogin, colUserPwd, colUserName, colUserFirstname, colUserKey, colUserDate)
                                        VALUES( '$login', '$pwd', '$name', '$firstname', '$clef', '$temps')");

            if($req){
                    $destinataire = $login;
                    $sujet ="Welcome on SnSR";
                    $from = "From: [email protected] \r\n";
                    $from .= "Content-Type: text/html; charset=us-ascii\r\n";

                    $message = ' Clic on the link below :<br/>
                    <a href="http://localhost/spotnshare/validation_mail.php?usrk='.$clef.' ">
                        Registration confirmation.
                    </a> ';

                    ini_set('SMTP','relay.skynet.be');

                    if(mail($destinataire,$sujet,$message,$from)){
                        $msg = 'Check your mailbox to activate your account !'; 
                    }           
                    else{
                        $msg = 'Problem sending you the activation mail !'; 
                        $req = mysql_query("DELETE FROM userTable WHERE colUserLogin = '".$pseudo."' ");
                    }
            }
            else{
                $msg = 'Problem inserting you in our database !';
            }
        }else{
                $msg = 'This email has already been used !';
        }
        mysql_free_result ($req);   

    }else{
        $msg = "Connexion problem with de DB"
        print(json_encode(array("message" => $msg)));       
    }

}else{
        $msg = "Couldn't treat your datas"
}

print(json_encode(array("message" => $msg)));

?>
</code>