ChartView with qml

[athandev]

I'm trying to use a ChartView on my qml code, like this

Rectangle {
    anchors.fill: parent
    color:"lightSteelBlue"
    BackEnd{
        id:myBackEnd
    }
    ChartView {
        width: 400
        height: 300
        theme: ChartView.ChartThemeBrownSand
        antialiasing: true
    
        PieSeries {
            id: pieSeries
            PieSlice { label: "eaten"; value: 94.9 }
            PieSlice { label: "not yet eaten"; value: 5.1 }
        }
    }

    Button{
...


//This is my main function
int main(int argc, char *argv[])
{
    qmlRegisterType<BackEnd>("BackEnd", 1, 0, "BackEnd" );
    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
    QGuiApplication app(argc, argv);
    mediator *m = new mediator();

    QQmlApplicationEngine engine;
    engine.rootContext()->setContextProperty("mediator",m);

    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
    if (engine.rootObjects().isEmpty())
        return -1;

    return app.exec();
}

And this is the error I'm receiving
"ASSERT: "!"No style available without QApplication!"" in file kernel\qapplication.cpp, line 1065"

I've already try most solutions around internet, none worked

[mrjj]

Hi
And you have the normal main.cpp that creates
a QApplication instance ?

#include <QApplication>
#include <QQmlApplicationEngine>

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    QQmlApplicationEngine engine;
    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));

    return app.exec();
}

[athandev]

@mrjj
no, I had "QGuiApplication app(argc, argv);" instead of " QApplication app(argc, argv);
" I just changed this line and everything works fine ! thank you!!