c++ - QMessageBox .gif file is not visible

Question

I have a QMessageBox and I put an animated gif on this Dialog with QLabel and inside QMovie instead of an icon. But there is a problem with the gif. When I refresh the screen somehow QMessageBox is working but the gif is not visible anymore.

QMessageBox msgBox(this);       
msgBox.setWindowTitle("Warning");
msgBox.setText("      This element is UNDER CONSTRUCTION!");
QLabel* label = new QLabel(&msgBox);                
label-> setWindowFlags(Qt::FramelessWindowHint);
QPixmap p("Resources/Images/General/construct.gif");

label->setPixmap(p);
label->setFixedHeight(40);
label->setFixedWidth(45);

QMovie *movie = new QMovie("Resources/Images/General/construct.gif");
label->setMovie(movie);
movie->start();    

label->show();

QAbstractButton *myYesButton = msgBox.addButton("I accept risk!", QMessageBox::YesRole);
QAbstractButton *myNoButton  = msgBox.addButton("Cancel", QMessageBox::NoRole);         
msgBox.exec();

if(msgBox.clickedButton() == myNoButton) return;