When I run my Qt messaging application it stops with exit code -1073741515.

Question

main:

#include "QtGui/QApplication"
#include "spc_login.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    SPC_LOGIN w;
    //#if defined(Q_WS_S60)
    //    w.showFullScreen();
    //#else
    //    w.show();
    //#endif
    w.showMaximized();
    return a.exec();
}

..other code:

protected:
    void changeEvent(QEvent *e);

    private:
        // QAction *softKeyAction;
        // QAction *leftSoftKeyAction;
        Ui::THREESPC_VERIFYINGNUMBER *ui;
        QHttp *getSinHttp;
        QHttp *getOutboundSMSHttp;
        QHttp *putStatusHttp;

        QXmlStreamReader xmlGetSinReader;
        QXmlStreamReader xmlCallOutboundReader;
        QXmlStreamReader xmlPutStatusReader;
        QTimer timer;
        QMessageId sendId;
        QMessageManager manager;
        QMessageService service;

When I comment out QMessageId and QMessageManager varibales then it works fine but when I uncomment these fields, it doesn't work and shows me the exit code -1073741515. Please help me.

Starting C:\NokiaQtSDK\QtCreator\bin\SPCWIDGET-build-simulator\debug\SPCWIDGET.exe...
C:\NokiaQtSDK\QtCreator\bin\SPCWIDGET-build-simulator\debug\SPCWIDGET.exe exited with code -1073741515