Program works normally but QML Reference Error

Hello, I have an program. It's probably work's normally but in "Application Output" I got some Reference Errors:

Code:

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qrc:/main.qml:17: ReferenceError: Keppoqml is not defined
qrc:/main.qml:17: ReferenceError: Keppoqml is not defined

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Code:

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import QtQuick 2.9
import QtQuick.Window 2.2
 
Window {
    visible: true
    width: 640
    height: 480
    title: qsTr("Hello World")
 
    TextInput {
        id: textInput
        objectName:"inputText"
        x: 48
        y: 58
        width: 80
        height: 20
        text: Keppoqml.message // Here's the error.
        font.pixelSize: 12
        onTextEdited:{
            Keppoqml.setWindowName(textInput.text);
        }
    }
 
    Rectangle {
        id: rectangle
        x: 276
        y: 41
        width: 112
        height: 56
        color: "#e30a0a"
 
        MouseArea {
            id: mouseArea
            x: 0
            y: 0
            width: 112
            height: 56
            onClicked:{
                Siemaqml.check();
            }
        }
    }
 
    Rectangle {
        id: rectangle1
        x: 276
        y: 180
        width: 112
        height: 62
        color: "#29ff46"
 
        MouseArea {
            id: mouseArea1
            x: 0
            y: 0
            width: 112
            height: 62
            onClicked:{
                Siemaqml.load();
            }
        }
    }
 
    Rectangle {
        id: rectangle2
        x: 36
        y: 227
        width: 101
        height: 106
        color: "#000000"
 
        MouseArea {
            id: mouseArea2
            x: 0
            y: 0
            width: 101
            height: 106
            onClicked:{
                Keppoqml.checkload();
            }
        }
    }
    Rectangle {
        id: rectangle5
        x: 276
        y: 324
        width: 112
        height: 62
        color: "#29ff46"
 
        MouseArea {
            id: mouseArea5
            x: 0
            y: 0
            width: 112
            height: 62
            onClicked:{
                Keppoqml.message;
            }
        }
    }
}

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Code:

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#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include <QDebug>
#include <keppoxd.h>
#include <siema.h>
#include <QQmlContext>
#include <QQmlApplicationEngine>
 
int main(int argc, char *argv[])
{
 
    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
 
    QGuiApplication app(argc, argv);
 
 
 
    siema siema;
    keppoxd keppo;
 
    keppo.siema = &siema;
 
    QQmlApplicationEngine engine;
    const QUrl url(QStringLiteral("qrc:/main.qml"));
    QObject::connect(&engine, &QQmlApplicationEngine::objectCreated,
                     &app, [url](QObject *obj, const QUrl &objUrl) {
        if (!obj && url == objUrl)
            QCoreApplication::exit(-1);
    }, Qt::QueuedConnection);
    engine.load(url);
 
 
    QQmlContext *ctx = engine.rootContext();
 
    ctx->setContextProperty("Siemaqml", &siema);
    ctx->setContextProperty("Keppoqml", &keppo);
 
    return app.exec();
}

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Code:

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#ifndef KEPPOXD_H
#define KEPPOXD_H
 
#include <QObject>
#include <QDebug>
#include <QSettings>
#include <QDir>
#include <siema.h>
 
class keppoxd : public QObject
{
    Q_OBJECT
public:
    explicit keppoxd(QObject *parent = nullptr);
    siema *siema;
 
    Q_PROPERTY(QString message READ message WRITE setWindowName NOTIFY textChanged)
 
 
signals:
    void textChanged();
public slots:
    QString message(){
        qDebug() << siema->name;
        return siema->name;
    }
    void setWindowName(QString value);
    void checkload();
 
};
 
#endif // KEPPOXD_H

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Code:

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#include "keppoxd.h"
 
keppoxd::keppoxd(QObject *parent) : QObject(parent)
{
    connect(this, SIGNAL (textChanged()), this, SLOT(message()));
}
 
void keppoxd::setWindowName(QString value)
{
   siema->name = value;
   qDebug() << "siema.name value from keppo class " << siema->name;
}
 
void keppoxd::checkload()
{
    qDebug() << "keppoload " << siema->name;
    emit textChanged();
}

---

Code:

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#ifndef SIEMA_H
#define SIEMA_H
 
#include <QObject>
#include <QDebug>
#include <QSettings>
#include <QDir>
#include <QQuickView>
 
 
class siema : public QObject
{
    Q_OBJECT
 
 
public:
    explicit siema(QObject *parent = nullptr);
 
    QString name = "old";
 
signals:
public slots:
    void check();
    void load();
 
};
 
#endif // SIEMA_H

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Code:

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#include "siema.h"
 
siema::siema(QObject *parent) : QObject(parent)
{
}
 
void siema::check()
{
    qDebug() << "siema value " << name;
 
    QSettings* settings;
    settings = new QSettings(QDir::currentPath() + "/config.ini", QSettings::IniFormat);
    settings->setValue("textfield", name);
    settings->sync();
}
void siema::load(){
    QSettings* settings;
    settings = new QSettings(QDir::currentPath() + "/config.ini", QSettings::IniFormat);
    name = settings->value("textfield").toString();
}

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You need to call setContextProperty() before you load the QML code.

Cheers,
_

I have it on my main file:

Code:

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#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include <QDebug>
#include <keppoxd.h>
#include <siema.h>
#include <QQmlContext>
#include <QQmlApplicationEngine>
 
int main(int argc, char *argv[])
{
 
    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
 
    QGuiApplication app(argc, argv);
 
 
 
    siema siema;
    keppoxd keppo;
 
    keppo.siema = &siema;
 
    QQmlApplicationEngine engine;
    const QUrl url(QStringLiteral("qrc:/main.qml"));
    QObject::connect(&engine, &QQmlApplicationEngine::objectCreated,
                     &app, [url](QObject *obj, const QUrl &objUrl) {
        if (!obj && url == objUrl)
            QCoreApplication::exit(-1);
    }, Qt::QueuedConnection);
    engine.load(url);
 
 
    QQmlContext *ctx = engine.rootContext();
 
    ctx->setContextProperty("Siemaqml", &siema);
    ctx->setContextProperty("Keppoqml", &keppo); // HERE
 
    return app.exec();
}

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Your code is loading the QML before it calls setContextProperty(). Read anda_skoa's reply again.