Nothing to be done for `first'.

[IdontExist]

I'm trying to compile my first QT programme but i came across a pretty popular problem, which I can't solve even after browsing this forum.
This is the code I am using:

#include <QCoreApplication>
#include <QDebug>
 
int main(int argc, char *argv[])
{
 
    QCoreApplication a(argc, argv);
    qDebug() << "hello";
    return a.exec();
}

#include <QCoreApplication>
#include <QDebug>

int main(int argc, char *argv[])
{

    QCoreApplication a(argc, argv);
    qDebug() << "hello";
    return a.exec();
}

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After trying to build it i get this 'error':

C:/MinGW/bin/mingw32-make -f Makefile.Debug
mingw32-make[1]: Entering directory `C:/Users/Max/Desktop/tutajjestQT/hello-build-Desktop_Qt_5_0_1_MinGW_32bit-Debug'
mingw32-make[1]: Nothing to be done for `first'.
mingw32-make[1]: Leaving directory `C:/Users/Max/Desktop/tutajjestQT/hello-build-Desktop_Qt_5_0_1_MinGW_32bit-Debug'

And w window with "Naci" written in it in which, later on, i can later whatever i want:
QT.jpg

Can anyone help me with what's wrong, please?