The header file 'mainwindow.h' doesn't include <QObject>.

[nhs_0702]

i want build Symbian QTcreator S60 5th like this instruction: http://v16.lscache3.c.youtube.com/vi...be37827648d40d
or http://labs.trolltech.com/blogs/2009...t-for-symbian/
but it error message

C:\Users\BotNetVN\Desktop\CamOnMoiNguoi\moc_mainwi ndow.cpp:12: #error "The header file 'mainwindow.h' doesn't include <QObject>."
ERROR: cpp.EXE failure
make[1]: *** [MAKEFILECAMONMOINGUOI_0XE8E190B0] Error 33

source: <link removed>


why error ?