qt creator compilation error with instruction <QtQuickWidgets/QQuickWidget>

[bvox123]

Good morning.
Unfortunately I do not speak English, sorry (I translated this message with the google translator).
In a trivial mainwindow.h generated automatically with qt creator, as soon as I insert the #include <QtQuickWidgets/QQuickWidget> statement, the compilation crashes with the following messages. How can I fix it? Thank you.

[raven-worx]

@bvox123
add QT += quickwidgets to your .pro file.
Don't forget to rerun qmake.