Insert into sqlite database

I have search on the other same problem on stackoverflow but I haven't find my problem. When I want to insert values on my SQLite database, I have an error that say I don't know firstName in the table. However, I have create firstName.

I give you my code DatabaseHandler:

public class DatabaseHandler extends SQLiteOpenHelper 
{

// All Static variables
// Database Version
private static final int DATABASE_VERSION = 1;

// Database Name
private static final String DATABASE_NAME = "android_project_database_user";

// Login table name
private static final String TABLE_LOGIN = "login";

// Login Table Columns names
private static final String KEY_NAME = "name";
private static final String KEY_FIRSTNAME = "firstName";
private static final String KEY_EMAIL = "mail";
// private static final String KEY_UID = "id";
private static final String KEY_COUNTRY = "country";
private static final String KEY_CITY = "city";


public DatabaseHandler(Context context) {
  super(context, DATABASE_NAME, null, DATABASE_VERSION);
}

// Creating Tables
@Override
public void onCreate(SQLiteDatabase db) {
 String CREATE_LOGIN_TABLE = "CREATE TABLE " + TABLE_LOGIN + "(" 
 // + KEY_UID + " INTEGER PRIMARY KEY,"
    + KEY_FIRSTNAME + " TEXT,"
    + KEY_NAME + " TEXT,"
    + KEY_EMAIL + " TEXT UNIQUE PRIMARY KEY,"
    + KEY_COUNTRY + " TEXT,"
    + KEY_CITY + " TEXT" + ")";
   db.execSQL(CREATE_LOGIN_TABLE);
 }

// Upgrading database
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) 
{
 // Drop older table if existed
 db.execSQL("DROP TABLE IF EXISTS " + TABLE_LOGIN);

 // Create tables again
 onCreate(db);
}

/**
 * Storing user details in database
 * */
public void addUser(String firstName, String name, String mail, String country, String city) 
{
 SQLiteDatabase db = this.getWritableDatabase();

 ContentValues values = new ContentValues();
 values.put(KEY_FIRSTNAME, firstName); // FirstName
 values.put(KEY_NAME, name); // Name
 values.put(KEY_EMAIL, mail); // Email
 // values.put(KEY_UID, id); // id
 values.put(KEY_COUNTRY, country); // country
 values.put(KEY_CITY, city); // city

 // Inserting Row
 db.insert(TABLE_LOGIN, null, values);
 db.close(); // Closing database connection
 }

 /**
  * Getting user login status
  * return true if rows are there in table
 * */
public int getRowCount() {
  String countQuery = "SELECT  * FROM " + TABLE_LOGIN;
  SQLiteDatabase db = this.getReadableDatabase();
  Cursor cursor = db.rawQuery(countQuery, null);
  int rowCount = cursor.getCount();
  db.close();
  cursor.close();

 // return row count
 return rowCount;
 }

 /**
 * Re crate database
 * Delete all tables and create them again
 * */
 public void resetTables(){
  SQLiteDatabase db = this.getWritableDatabase();
  // Delete All Rows
  db.delete(TABLE_LOGIN, null, null);
  db.close();
 }

}

And my login.java

  public class LoginActivity extends Activity implements OnClickListener{

  // Edit and Button that the user fill
  private EditText mail, pass;
  private Button bLogin;
  private CheckBox checkBox;

  /****************/
  /* Réponse JSON */
  /****************/
  //  private static String KEY_UID = "id";
  private static String KEY_NAME = "name";
  private static String KEY_FIRSTNAME = "firstName";
  private static String KEY_EMAIL = "mail";
  private static String KEY_COUNTRY = "nationality";
  private static String KEY_CITY = "city";

  /**********************************/
  /* Enregistrement des préférences */
  /**********************************/

  public static final String PREFS_NAME = ".Preferences";   
  private static final String PREF_EMAIL = "email";
  private static final String PREF_PASSWORD = "password";
  private static final String PREF_CHECKED = "checked";


  // Progress Dialog
  private ProgressDialog pDialog;

  // JSON parser class
  JSONParser jsonParser = new JSONParser();
  private static final String LOGIN_URL = "http://ift.tt/1N3GJGv";
  private static final String TAG_SUCCESS = "success";
  private static final String TAG_MESSAGE = "message";
     @Override
    protected void onCreate(Bundle savedInstanceState) {       
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_login);      
          mail = (EditText)findViewById(R.id.email);
          pass = (EditText)findViewById(R.id.pass);          
          bLogin = (Button)findViewById(R.id.identify);
          checkBox = (CheckBox)findViewById(R.id.cbRememberMe);

              /***********************************************************************/
          /* Restauration des préférences sauvegardées si la checkbox est cochée */
          /***********************************************************************/    

          SharedPreferences pref = getSharedPreferences(PREFS_NAME,MODE_PRIVATE);  
          String email = pref.getString(PREF_EMAIL, "");
          String password = pref.getString(PREF_PASSWORD, "");
          String checked = pref.getString(PREF_CHECKED, "");

          mail.setText(email);
          pass.setText(password);
          checkBox.setChecked(Boolean.parseBoolean(checked));

          bLogin.setOnClickListener(this);
                }

    @Override
    public void onClick(View v) {

        /************************************************************/
        /* Enregistrement des préférences si la checkbox est cochée */
        /************************************************************/  

        if(checkBox.isChecked())
        {
          getSharedPreferences(PREFS_NAME,MODE_PRIVATE)
            .edit()
            .putString(PREF_EMAIL, mail.getText().toString())
            .putString(PREF_PASSWORD, pass.getText().toString())
            .putString(PREF_CHECKED,"TRUE")
            .commit();
        }

        /***********************/
        /* Sinon on les efface */ 
        /***********************/  

        else if(!checkBox.isChecked())
        {
           getSharedPreferences(PREFS_NAME,MODE_PRIVATE).edit().clear().commit();
        }

          switch (v.getId()) {
          case R.id.identify:
                      new AttemptLogin().execute();
          // here we have used, switch case, because on login activity you may //also want to show registration button, so if the user is new ! we can go the //registration activity , other than this we could also do this without switch //case.
          default:
                break;
          }
    }

    class AttemptLogin extends AsyncTask<String, String, String> {
           /**
       * Before starting background thread Show Progress Dialog
       * */
          boolean failure = false;

      @Override
      protected void onPreExecute() {
          super.onPreExecute();
          pDialog = new ProgressDialog(LoginActivity.this);
          pDialog.setMessage("Attempting for login...");
          pDialog.setIndeterminate(false);
          pDialog.setCancelable(true);
          pDialog.show();
      }

          @Override
          protected String doInBackground(String... args) {
                // TODO Auto-generated method stub
                 // here Check for success tag
          int success;
          String email = mail.getText().toString();
          String password = pass.getText().toString();
          try {

              List<NameValuePair> params = new ArrayList<NameValuePair>();
              params.add(new BasicNameValuePair("mail", email));
              params.add(new BasicNameValuePair("password", password));

              Log.d("request!", "starting");

              //utilise JSON pour renvoyer resultat
              JSONObject json = jsonParser.makeHttpRequest(
                     LOGIN_URL, "POST", params);

              // checking  log for json response
              Log.d("Login attempt", json.toString());

              // success tag for json
              success = json.getInt(TAG_SUCCESS);
              if (success == 1) {

                  /***************************************/
                  /* Stocke les infos dans la BDD SQLite */
                  /***************************************/

                  DatabaseHandler db = new DatabaseHandler(getApplicationContext());
                  db.resetTables();
                  db.addUser(json.getString(KEY_FIRSTNAME), json.getString(KEY_NAME), json.getString(KEY_EMAIL), json.getString(KEY_COUNTRY), json.getString(KEY_CITY));

                  /***************************************/
                  /* Lancement de l'Activity "MainMenuActivity" */
                  /***************************************/  

                Log.d("Successfully Login!", json.toString());

                Intent i = new Intent(LoginActivity.this,MainMenuActivity.class);

                startActivity(i);

                finish();

                return json.getString(TAG_MESSAGE);
              }else{

                return json.getString(TAG_MESSAGE);

              }
          } catch (JSONException e) {
              e.printStackTrace();
          }

          return null;
          }
          /**
       * Once the background process is done we need to  Dismiss the progress dialog asap
       * **/
      protected void onPostExecute(String message) {

          pDialog.dismiss();
          if (message != null){
                Toast.makeText(LoginActivity.this, message, Toast.LENGTH_LONG).show();
          }
      }
    } 
}

And to finish my login.php

<?php
session_start();

include ('config.php');

// Recup elem to make the login_connection
$password=$_POST["password"];
$mail=$_POST["mail"];

 if (!empty($_POST)) {
 if (empty($_POST['mail']) || empty($_POST['password'])) {
 // Create some data that will be the JSON response 
      $response["success"] = 0;
      $response["message"] = "One or both of the fields are empty .";
      die(json_encode($response));
  }

//prepare the select statement
$query = $handler->prepare('SELECT id, name, firstName, mail, nationality, city FROM login WHERE mail = :mail AND password= :password');

//bind the parameters
$query->bindParam(':mail', $mail, PDO::PARAM_STR);
$query->bindParam(':password', $password, PDO::PARAM_STR);

//execute the prepared statement
$query->execute();

//create array
$response = array();

//check for a result
$row = $query->fetch(PDO::FETCH_ASSOC);

if (!empty($row)) {
    $response["success"] = 1;
    $response["message"] = "You have been sucessfully login";
    $response["id"]= $row["id"];
    $response["firstName"]= $row["firstName"];
    $response["name"]= $row["name"];
    $response["mail"]= $row["mail"];
    $response["nationality"]= $row["nationality"];
    $response["city"]= $row["city"];

    $_SESSION['mail'] = $mail;
    die(json_encode($response));
  }
}
else{

$response["success"] = 0;
      $response["message"] = " One or both of the fields are empty ";
die(json_encode($response));
}
?>

When I display the value of each elements that I want to put in my dataBase, they take their good value.

Thank you very much for your help.

Mickey74