cannot create a qwidget without qapplication although qapplication is included

Asked Nov 16 '17 at 03:51

Active Apr 04 '18 at 14:03

Viewed 975 times

Following error has showed up all of a sudden:

QWidget: Cannot create a QWidget without QApplication

It was working fine and I have QApplication included and a QApplication object declared before MainWindow, but the error is still there.

#include "mainwindow.h"
#include <QApplication>


int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;

    w.show();

    return a.exec();
}

edited Apr 04 '18 at 14:03

cbuchart

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asked Nov 16 '17 at 03:51

Ness

what error????? – eyllanesc Nov 16 '17 at 03:53
1

I recommend you read the following to improve your questions: [How do I ask a good question?](https://stackoverflow.com/help/how-to-ask) – eyllanesc Nov 16 '17 at 03:54
the error that is in the title ? – Ness Nov 16 '17 at 03:55
1

Try to have a short and descriptive title, and explain in detail in the question body. We give more importance to the content as it gives us more information about the error. Going to the point, that error is caused when you want to create a widget before creating QApplication. – eyllanesc Nov 16 '17 at 03:57
And how would I solve it ? – Ness Nov 16 '17 at 03:59
I recommend going to the Build menu of QtCreator and running Clean All, and then run qmake. – eyllanesc Nov 16 '17 at 03:59
Okay I'll try it, thank you ^^ – Ness Nov 16 '17 at 04:00
Quite apart from the question I recommend you take the [tour](https://stackoverflow.com/tour) so that you know the rules and good practices in SO. – eyllanesc Nov 16 '17 at 04:01
Alright, thank you again, it finally worked ^^ – Ness Nov 16 '17 at 04:12

cannot create a qwidget without qapplication although qapplication is included

0 Answers0