QSQLITE driver not loaded

I'm creating a light APP with QT that add entries into my SQLITE base from my website.

But I've this problem :

("QSQLITE")

QSqlError(-1, "", "")

DATABASE OPENED

QSqlQuery::prepare: database not open

QSqlError(-1, "Driver not loaded", "Driver not loaded")

I'm on a Bananapi (Debian 7) with QT installed and upgrade from Debian-APT.

This is my code :

// Load QSLite driver
qDebug() << bdd.drivers(); //Said : ("QSQLITE")
bdd = QSqlDatabase::addDatabase("QSQLITE");
qDebug() << bdd.lastError();

// Open the database
bdd.setDatabaseName("/var/www/config/database.sqlite");

// Connect to the database
if( ! bdd.open())
{
    qDebug() << "ERROR " << EXIT_FAILURE_CANT_OPEN_DATABASE << " : Can't open database";
    qDebug() << bdd.lastError();
    exit(EXIT_FAILURE_CANT_OPEN_DATABASE);
}
else
    qDebug() << "DATABASE OPENED";

query.prepare(....); //Said : QSqlQuery::prepare: database not open.

Any idea ?