I have the following code:

Qt Code: 
  1. #include "mainwindow.h"
  2. #include "ui_mainwindow.h"
  3. #include <QtSql>
  4. #include <QDebug>
  5.  
  6. MainWindow::MainWindow(QWidget *parent) :
  7.     QMainWindow(parent),
  8.     ui(new Ui::MainWindow)
  9. {
  10.     ui->setupUi(this);
  11.     QSqlDatabase m = QSqlDatabase::addDatabase("QSQLITE");
  12.     m.setDatabaseName(":baza:");
  13.     bool ok = m.open();
  14.     if (ok)
  15.     {
  16.     qDebug() << "connected" << endl;
  17.     }
  18.     else
  19.     {
  20.     qDebug() << "not Connected " << endl;
  21.     qDebug() << QSqlDatabase::drivers() << endl;
  22.     qDebug() << m.lastError();
  23.     }
  24.  
  25. }
  26.  
  27. MainWindow::~MainWindow()
  28. {
  29.     delete ui;
  30. }
  31.  
  32. void MainWindow::changeEvent(QEvent *e)
  33. {
  34.     QMainWindow::changeEvent(e);
  35.     switch (e->type()) {
  36.     case QEvent::LanguageChange:
  37.         ui->retranslateUi(this);
  38.         break;
  39.     default:
  40.         break;
  41.     }
  42. }
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and it's returning:

Qt Code: 
  1. not Connected  
  2.  
  3. ("QSQLITE", "QODBC3", "QODBC") 
  4.  
  5. QSqlError(-1, "Error opening database", "unable to open database file")
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What's wrong?