Unsolved app.setFont not work in static build Qt

[MohsenNz]

I defined my font in .qrc resources . I wanted to set a default font for my app.
I am developing a qtqucik application.
when I build my app normally (in qtqreator) it's work fine.
but when build my app statically , it don't recognize the font.
bellow is my code:

int id = QFontDatabase::addApplicationFont(":/Fonts/Ubuntu-R.ttf");
QString family = QFontDatabase::applicationFontFamilies(id).at(0);
QFont ubuntuFont(family);
app.setFont(ubuntuFont);

[Christian Ehrlicher]

You should read what needs to be done with resources when using static linking: http://doc.qt.io/qt-5/resources.html#using-resources-in-the-application