How to fix resources.qrc not loading images

I'm trying to load images from my resources.qrc but it doesn't seem to work. For instance:

    cardVN1->setImage("://vn1.jpg");// The set image function is user-defined passing a QString

void CustomCard::setImage(QString img_path){
    QImageReader imageReader(img_path);
    if(!imageReader.canRead()){
        qDebug()<<"Cannot load image resource!";
        return;
    }
    QSize img_size = imageReader.size();
    int w = img_size.width();
    int h = img_size.height();
    QPixmap image(img_path);
    setStyleSheet("QPushButton{height: w}");
    imageView->setPixmap(image.scaled(w,h, Qt::KeepAspectRatio, Qt::SmoothTransformation));
}

My resources.qrc looks like:

<RCC>
    <qresource prefix="/images">
        <file>vn1.jpg</file>
        <file>vn2.jpg</file>
    </qresource>
</RCC>

It has been registered in my CMakeLists.txt as:

qt_add_executable(MwendwaLB
    WIN32 MACOSX_BUNDLE
    main.cpp
    mainwindow.cpp
    mainwindow.h
    mainwindow.ui
    customcard.h customcard.cpp
    assets.qrc
)

Any anomalies or suggestions?

UPDATE: I was able to fix the error. I had to add

SET(CMAKE_AUTORCC ON)

in my CMakeLists.txt.