Splash Screen doesn't work

[scralings]

I get this error

C2039: 'setModal' : is not a member of 'SplashScreen'						40:
	C:\Users\scralings\Documents\Mook's Work\Trains\MyLEGOTrain2\mainwindow.cpp:

Can anybody Help? My Code looks like this…

My PRO:

SOURCES += main.cpp\
    mainwindow.cpp \
    splashscreen.cpp
HEADERS  += mainwindow.h \
    splashscreen.h
FORMS    += mainwindow.ui \
splashscreen.ui

My H:

private slots:
     void on_actionSplashScreen_triggered();

My CPP:

#include "splashscreen.h"

void MainWindow::on_actionSplashScreen_triggered()
{
     SplashScreen mySplashScreen;
     mySplashScreen.setModal(true);
     mySplashScreen.exec();
 }

[Ratzz]

@scralings
Is your SplashScreen a QDialog ? http://doc.qt.io/qt-4.8/qdialog.html#modal-prop

also http://stackoverflow.com/questions/26107423/qt-setmodal-does-not-work