MySQL Connection

[Niunzin]

Hey!

I need make an MySql connection, but I receive this error:
http://i.imgur.com/weMsU.png

My code:

#include <QtSql>

#include <QtSql>

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QSqlDatabase *db = new QSqlDatabase();
    db->addDatabase( "QMYSQL3" ) ;
    db->setDatabaseName( "dbToConnectTo" ) ;
    db->setHostName( "localhost" ) ;
    db->setUserName( "dbUser" ) ;
    db->setPassword( "dbPassword" ) ;
    if ( !db->open() ) {
        QMessageBox *Ola = new QMessageBox(ui->centralWidget);
        Ola->setText("Failed opening database dbToConnectTo\nReason:\n\n" + db->lastError().driverText() + "\n\n" + db->lastError().databaseText());
        Ola->setIcon(QMessageBox::Warning);
        Ola->setStyleSheet("background: none");
        Ola->show();
    }

QSqlDatabase *db = new QSqlDatabase();
    db->addDatabase( "QMYSQL3" ) ;
    db->setDatabaseName( "dbToConnectTo" ) ;
    db->setHostName( "localhost" ) ;
    db->setUserName( "dbUser" ) ;
    db->setPassword( "dbPassword" ) ;
    if ( !db->open() ) {
        QMessageBox *Ola = new QMessageBox(ui->centralWidget);
        Ola->setText("Failed opening database dbToConnectTo\nReason:\n\n" + db->lastError().driverText() + "\n\n" + db->lastError().databaseText());
        Ola->setIcon(QMessageBox::Warning);
        Ola->setStyleSheet("background: none");
        Ola->show();
    }

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In .pro:

QT += sql

QT += sql

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Please help me :/
hugs